Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddacd7f84311e8f5…

MALICIOUS

PDF

72.9 KB Created: 2021-06-02 16:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3d5db3f589c047f8747fe21d21fac118 SHA-1: 5802172600f182ae30c35ec2b7514f912da00422 SHA-256: ddacd7f84311e8f55620cbd9a0ce58663eb64307218e8cf2342a1171bddca4bb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ketchas.ru/pbw?utm_term=transformers+earth+wars+mod+apk+unlimited+cyber+coins+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486199/normal_601b351abb67b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fd780fc9c32e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_604ec05d63f8e.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/zibulaxapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_6023cb771d9f4.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/ec82f9a76.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/190bc1fdd.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/gadagiraxudijazuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd661976a6c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_603229747db40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_605e1c50684b5.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/zumovunud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd5cda7-58a1-4dd3-ab48-48bcaff2ffb0/86463558695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3004a8cb-e763-4c60-b34d-818561ca2d9a/hp_officejet_pro_7740_user_guide.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144466776/arnold_boecklin_std_regular_font_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4713fb1e-ad23-4999-9a3f-67d3c1fc0775/73809045522.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144460206/what_is_the_lightest_truck_camper.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427695/wozujepiduvumup.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144427248/jidelimeterodugitet.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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 6224 bytes
SHA-256: e9bf9b4496b4c4afe296194e7387e11f18b726eb872bb0b2edbefa863ae91bf2
font_01_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 11260 bytes
SHA-256: b23bb19b54500ad63d0f4854b969f3b5c64c30a448e1c5459de3ef9994deed51

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