Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba64ccc3eb3f263…

MALICIOUS

PDF

79.3 KB Created: 2021-04-20 19:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7bcd57b8ae7dbb41263525f685495cd9 SHA-1: a56254a3c759eca6f8a2eb98b04bcc10721baca2 SHA-256: cba64ccc3eb3f263de6de81fcb802a7dc9562249dc01e2058189ee7ab2963af6
196 Risk Score

Malware Insights

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

The PDF contains a link farm and an SEO redirector, indicating a phishing attempt disguised as a free download. The primary malicious URL identified is https://xajibur.ru/strik?utm_term=best+traditional+irish+music+pubs+in+dublin. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xajibur.ru/strik?utm_term=best+traditional+irish+music+pubs+in+dublin PDF link annotation
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/2821092.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/fodub.pdfIn PDF document text
    • http://dihtyar.online/50331204569g1zqs.pdfIn PDF document text
    • http://trenketo.buzz/jopujovijaxozilimofhjmby.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/lyman_48_reloading_manual.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/1599585.pdfIn PDF document text
    • http://fastpeysistem.online/vukutumademi0hf3v.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/vexeliku/sherlock_holmes_books_chronology.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_75ed1776c3ee4b4cbfe344ba97502f15.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_5766c5af6c474c39897cda209e8be6a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/whirlpool_quiet_partner_iv_no_power.pdfIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_cd6e1e6bd1b0490bbfc538c4fd7d5d15.pdf?index=trueIn PDF document text
    • http://riveminigokoxa.myartsonline.com/rsos_admission_form_2020_18.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_a0c2d8431784449f90d5bde542d0d7ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/wigalexojojejutep.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/do_dysons_have_hepa_filters.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_a0ff9c7210c641508d8cbbc26c7c5c2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/tere_bin_laden_song_ming.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_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 5504 bytes
SHA-256: 80eb8fd44cf55214800a0dbc22c17ec9dcd8ae061b4b1f844ce85a1a6bfeb9c6
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 11772 bytes
SHA-256: bc1c1dbd1c51bae62d6df2fe2c294ec71ecdd741fb21786401198345f26ef981

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