Malicious PDF — malware analysis report

Static analysis result for SHA-256 42872264ce3ca085…

MALICIOUS

PDF

80.4 KB Created: 2021-06-13 19:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55541b750132361cfc14bc24b056741d SHA-1: d45f00e2095efe592a94a00643610ac741c3deb0 SHA-256: 42872264ce3ca08509289f5571f47dd975ab5ad4dfeba3cad0fd532e1e47294d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by multiple engines, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://philabc.ru/pbw?utm_term=find+quotient+and+remainder+of+polynomials, which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=find+quotient+and+remainder+of+polynomials
    • https://toxerixefekivi.weebly.com/uploads/1/3/5/2/135296371/totozemon.pdf
    • https://dipakiwafopij.weebly.com/uploads/1/3/0/7/130740044/8041714.pdf
    • https://xenexaguvu.weebly.com/uploads/1/3/4/2/134265948/fejemunireterekulin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/725d972b-a5da-4637-a6b6-924218ce08ad/wazemedame.pdf
    • https://uploads.strikinglycdn.com/files/5ca6a4f2-7d7e-4576-902d-4285596c4e4d/99724782290.pdf
    • http://reravupavad.pbworks.com/f/likes_followers_on_instagram_apk.pdf
    • http://sukagafamo.pbworks.com/w/file/fetch/144935493/easy_exploits_roblox.pdf
    • http://lopasexosew.pbworks.com/w/file/fetch/144774801/86964832940.pdf
    • http://lagawiwefe.pbworks.com/w/file/fetch/144879477/7045077537.pdf
    • http://fibonilavi.pbworks.com/f/assassins_creed_origins_apk_obb_download.pdf
    • https://uploads.strikinglycdn.com/files/30e0ebf1-c3ca-40ac-b8a9-b0309ae7e513/gokalulezebejuve.pdf
    • https://uploads.strikinglycdn.com/files/e71d5540-d1f6-4843-8781-0375ea9651ed/sony_hdr_as20_webcam.pdf
    • https://uploads.strikinglycdn.com/files/75aae0a8-8cbf-47f2-beae-7156997448f5/final_fantasy_xv_review_pc.pdf
    • https://uploads.strikinglycdn.com/files/2b1859de-7ad5-4e69-9595-10dce3ae9295/kadinarijuwogorav.pdf
    • https://uploads.strikinglycdn.com/files/056594a7-26f0-4510-b773-86cee667f1fc/liftmaster_chamberlain_41a5021-1h-315_manual.pdf
    • http://veposasidot.pbworks.com/f/89030978250.pdf
    • https://uploads.strikinglycdn.com/files/496a4fd2-10df-469a-ae8a-7415a8198d9e/82575550517.pdf
    • https://uploads.strikinglycdn.com/files/c22648eb-f58d-404f-817f-c36b45eedf93/what_are_the_blending_words.pdf
    • http://nagaxop.pbworks.com/f/bobelatovadabaxinujosibi.pdf
    • https://uploads.strikinglycdn.com/files/f8e2781f-824a-47b7-87d9-8a5f63a8686a/88942865692.pdf
    • http://nugewil.pbworks.com/f/jitaferefijolaxoker.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa59.bin
37db2de29ad2d2f2d403e23b2c9927c470a8e487790c65dfcf1f45fde7a6b42f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 5372 bytes
font_01_sfnt_off00010c91.bin
2f5648e43133e3a9d05d14c7e9625f1094dcf6794a801372e9659e7415bd9618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 11516 bytes

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