Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2db8335ae27b0a9…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 15:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2a9000650c96aa127fa5de4d0dc8b16e SHA-1: a4f9524fc836df50b8fd3690550a0c9d0fffe525 SHA-256: a2db8335ae27b0a9d78b864ed63281863c6c73efd041fc3f228a15b043656ca8
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme, and also includes a call-to-action button lure. The primary malicious function appears to be directing users to external URLs that likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/award?keyword=positioning+strategy+example+pdf PDF link annotation
    • http://kapovulup.mywebcommunity.org/17753292600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_6026650db6f2f.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/symbolic_logic_carroll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fd273b41bf4c.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/lugixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5ff9a60789857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_472a553ce3fa4e13b187319aa1c84421.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f109542-b6ea-4fbc-a28e-3ba65ebffb29/can_h2s_form_hydrogen_bonds.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_995bf4087b3240debf1c5a297e7148c9.pdf?index=trueIn PDF document text
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_1adc0a6cd78142f1ab139c405c2ea455.pdf?index=trueIn PDF document text
    • http://maretubozewugi.myartsonline.com/mamoxiz.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_943d88a57d4b48cbb17753691a637556.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d657f7-daa2-4ea1-be47-5a9def8ed535/harry_potter_movies_live_stream_free.pdfIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_d645565f1ab84fb988fa48562c0049cc.pdf?index=trueIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_0ed8fa69f07f4f94862f04cab1115e40.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_148f2206fa1240e8aa1847d4472759fa.pdf?index=trueIn 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_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 5532 bytes
SHA-256: 6447db4550d5cac97f077789a72f7c9a6b893c3086e314e41a48253ed725e35e
font_01_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 11048 bytes
SHA-256: c6d5e6d4c81d53a00b57b7fc903f68c3fc9abdd9296b32c2168baabc840d9d72

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