Malicious PDF — malware analysis report

Static analysis result for SHA-256 716e1778635510c0…

MALICIOUS

PDF

80.4 KB Created: 2021-03-29 22:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fe5bea06f12f75d0a2aa6d1edc39688 SHA-1: 55d5d62f322c78b0789b895a3915a7714175afbf SHA-256: 716e1778635510c0c8c5e42a52572a6240fb99b0e0f054efb4f0c9211cbc174e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lead the user to malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=adobe+illustrator+cs6+crack+dll+64+bit
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/1452777.pdf
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/pepumutipamexumivuvi.pdf
    • https://static.s123-cdn-static.com/uploads/4372740/normal_5ffd6e95a7553.pdf
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fdcbf5de57b2.pdf
    • http://fastpeysistem.online/504472836348z22.pdf
    • https://jowizixevudaw.weebly.com/uploads/1/3/4/4/134489406/6153424.pdf
    • https://static.s123-cdn-static.com/uploads/4454306/normal_5ff151fcaba36.pdf
    • http://arfeshome.com/preface_to_lyrical_ballads_1802g1vfa.pdf
    • https://janukavosoxavu.weebly.com/uploads/1/3/4/3/134318620/vuzipejugadapiteza.pdf
    • https://cdn-cms.f-static.net/uploads/4459621/normal_600dd09b08623.pdf
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fcbdf4510429.pdf
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fdb16431f7b5.pdf
    • http://trickyturkey.com/bostitch_f21pl_framing_nailer_revieww1qaw.pdf
    • http://fashion-deals.xyz/4354967662cev3j.pdf
    • http://topmassage.net/murejoxoxadidatevapjwzw.pdf
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fe359a7b9ab2.pdf
    • https://static.s123-cdn-static.com/uploads/4379048/normal_6008b8881d0a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21697126-30a8-41d9-be45-5a4f718e4c0e/75671465752.pdf
    • https://uploads.strikinglycdn.com/files/b753aa8f-160c-427f-83c6-943a48e2bd01/how_to_put_calculator_in_degree_mode_casio_fx-991ex.pdf
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_da06e0abb46c4c888b88c62f804d7cf0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c61a54b0-9a93-463d-9bd0-19cb46760e7e/gasilisixijefa.pdf
    • https://uploads.strikinglycdn.com/files/29de03e6-5075-4836-9d37-a29ebb35978b/68947568310.pdf
    • https://uploads.strikinglycdn.com/files/ff4c872c-4bcd-4479-8964-4e135a8f7395/excel_sheet_wont_scroll_with_mouse.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_76c6ecfc23724b0b85bba92825e200cd.pdf?index=true
    • 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_off0000eb11.bin
09e6de2f7b4f53cce9141512fc4afd4686d728eac4385b9df6ec72c166b92e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 5368 bytes
font_01_sfnt_off0000fd64.bin
a37e45c8ee8c82975656dd2516645ded148474ddb2e92830b8fb94b96ab8deb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 23624 bytes

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