Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6382ae146ba720…

MALICIOUS

PDF

85.9 KB Created: 2021-03-30 22:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e790cedc681d7c420637d8b921c04c6c SHA-1: 8baf0a6cccbe67b88b433a314b1ab1ca8e552533 SHA-256: ac6382ae146ba7200480be0e68f932642d12bf7edfa1c1aab710ff9753e3033b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on 'bologen.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links among many others. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=12.3+dna+replication+worksheet+answer+key+pdf PDF link annotation
    • http://soldatskaya6.ru/how_to_set_temperature_on_a_whirlpool_fridgedt990.pdfIn PDF document text
    • https://tapoduxumusuna.weebly.com/uploads/1/3/4/7/134733142/jasarukuji-kerela-tozamez.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/dukapega.pdfIn PDF document text
    • http://fipagolanikobax.mygamesonline.org/pozugizamixus.pdfIn PDF document text
    • http://alcozerox.com/borufapobosufinazogunomerv4wn.pdfIn PDF document text
    • http://gtomishebs.xyz/rebajepigak2zxqf.pdfIn PDF document text
    • http://kungfumalibu.com/facebook_for_macos_mojavems1rd.pdfIn PDF document text
    • http://zasopawemumobaw.iblogger.org/excel_master_sheet_tutorial.pdfIn PDF document text
    • http://sexesex.site/16651416127s70sn.pdfIn PDF document text
    • http://vukosodo.iblogger.org/judozasuruwivevenabaruzax.pdfIn PDF document text
    • http://fajiragudabega.iblogger.org/kajupelaxa.pdfIn PDF document text
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/zigef.pdfIn PDF document text
    • http://dodojuf.22web.org/wasoladujorugotibiwom.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/wopub-papobu-taradixoworam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/graphic_design_flyer_templates.pdfIn PDF document text
    • http://josuxak.atwebpages.com/ashokan_farewell_guitar_chords.pdfIn PDF document text
    • http://bilewotefizu.rf.gd/barron_s_gre_word_list_flashcards.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/gowerebiruxelatel.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_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 5784 bytes
SHA-256: 56b01c4122f2c826ea5211cb6ff775b6658538ea301d8f6b032192129e77c72a
font_01_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 10656 bytes
SHA-256: 4c16ee5f1c4c3aee8833d0655901f305bd1630b93c1ddc166e7f606af8b807e3

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