Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da0b216f36d8e56…

MALICIOUS

PDF

78.3 KB Created: 2021-06-02 08:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 01366bad977a30b030b4f3721db0e4f5 SHA-1: b62665afb162d3a61e91f0620a48dacdbcd6bd3f SHA-256: 8da0b216f36d8e56657e20d9b14e760530b53cf0d2212bb81dff8370e1d931d7
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 designed to redirect users. One of the primary URLs is https://irlanc.ru/pbw?utm_term=types+of+chemical+reaction+worksheet+ch.+7+answers+g+through+t, which is presented as a worksheet with answers, likely a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/pbw?utm_term=types+of+chemical+reaction+worksheet+ch.+7+answers+g+through+t PDF link annotation
    • https://nadoxeruxumebis.weebly.com/uploads/1/3/1/3/131398019/wusatufiwum-nexupixu-retesivi-putajeretuvat.pdfIn PDF document text
    • https://bavazaje.weebly.com/uploads/1/3/4/3/134335981/9731374.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/zapazopemoxebopasaf.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/pomisudo_mejageka_lovedizagusele_gonafuvoxodaw.pdfIn PDF document text
    • https://fimizugowukabi.weebly.com/uploads/1/3/1/1/131164572/ximadelu_tevafiluzuz_votoxubisisi_labexiji.pdfIn PDF document text
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/tefarixadonataxe.pdfIn PDF document text
    • https://xawajedub.weebly.com/uploads/1/3/4/8/134886715/7703482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0f3225-77c3-4da9-a86e-fb6e90b9a222/sibelius_6_keyboard_shortcuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad5e5c2-67a4-4f10-af55-83cff2b7e0ca/69994708474.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/w/file/fetch/144494190/79352409722.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/26994856035.pdfIn PDF document text
    • http://gonumutat.pbworks.com/w/file/fetch/144488175/65525976755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9d7d8a-7e16-485e-99cc-cbf2ba786dfa/69067232178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652b121f-540b-45f0-ac3a-1e28e12ce317/tekelut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880f684b-4ce3-4c2f-afdf-2fffe11064b2/skilsaw_5275_parts.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412365/sibuwafesukarewuwet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434e6fc6-105f-4428-9a1a-034f3fc8e834/sisopog.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/56672569474.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144424371/solving_quadratic_equations_practice_worksheet_answers.pdfIn 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_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 5748 bytes
SHA-256: ecce5697b0c9101aec17827fa93d7fa68a3fce2f136712e53fe9fad3496e9426
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10776 bytes
SHA-256: d7ac603c2d064c2b596aeada64fdc772005f6f6c3aeef3c1acd66ec15b66eb96