Malicious PDF — malware analysis report

Static analysis result for SHA-256 531a79407e25fbf8…

MALICIOUS

PDF

82.2 KB Created: 2021-04-03 22:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d7951615c835980fe4906a19e2e910de SHA-1: c9b30d7d0303c1a930e42de4d9653f975519d1cd SHA-256: 531a79407e25fbf881f69340383ba4e06aba1644ace3f21fddf779af86264f63
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to 'annual income certificate', likely a lure to encourage users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=annual+income+certificate+pdf PDF link annotation
    • http://fosavaxenu.mypressonline.com/there_is_there_are_worksheet_islcollective.pdfIn PDF document text
    • https://galojonebe.weebly.com/uploads/1/3/4/3/134353990/94567642524c40.pdfIn PDF document text
    • http://giocodigital.space/what_is_the_strongest_spirit_in_smashgaafp.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/kuxiditoruf-kuxekuzepef-bebogu-vudumapu.pdfIn PDF document text
    • https://mikexilip.weebly.com/uploads/1/3/4/8/134868220/mulofolapawimepelora.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/bapiso.pdfIn PDF document text
    • https://koborabi.weebly.com/uploads/1/3/0/7/130775888/02bcca9d459848c.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/xuwajitawusade-feniwusejopud.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/ies_master_irrigation_engineering.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/how_do_you_find_the_enthalpy_change.pdfIn PDF document text
    • http://belkwigs.com/tenet_information_privacy_security_test_answersilrg4.pdfIn PDF document text
    • http://stnold.com/the_magic_of_believing_audiobook717ho.pdfIn PDF document text
    • https://vizokajobekaxa.weebly.com/uploads/1/3/0/9/130969885/dakeburu.pdfIn PDF document text
    • http://docita.fun/pajesotetugatarusibilufewand09.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/lukimutelixatibuzabalik.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/pevidesenasago.pdfIn PDF document text
    • http://nakanilo.club/delta_miter_saw_stand_36-267_reviewne31x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_ffbcf4d5a4d248a9b422b7ecadaa7b79.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_e20b6d5c124d4db48912cf728b960cf2.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_013901ea966748ae8974b654da474d39.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_24204cfe328c4002a2cbc05ef8b94721.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_4b6d176084f448fdbeeec0a7fa997915.pdf?index=trueIn PDF document text
    • http://pixafur.atwebpages.com/jolegebuzasedivabep.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_407d0adf937e4999ab7f01b8725352a8.pdf?index=trueIn PDF document text
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_13c30af0c5c144ad8608ea4f885d79d5.pdf?index=trueIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_1fbf14e39e92416eb2ee88485768ed05.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_97990a3ce1b94062a0dea77608b8ab8c.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_2c9cf9fb78314388ac8a29ec8103d5b0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 5112 bytes
SHA-256: 15ee828120aef0aa57bfb6256d09a3989377e54aae5d137cc716f88109ce7b90
font_01_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 10852 bytes
SHA-256: b033bf7371ca501b7ee18379ba5fc53cbc1f388f7d658a42600af17b1d6e099e

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