Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb4bf51b8ced91e…

MALICIOUS

PDF

75.5 KB Created: 2021-01-13 21:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 446d92528bdf957125ca35419d029d48 SHA-1: 2826d5cd133c8ae6681b8490b8e1ef0e80778456 SHA-256: fdb4bf51b8ced91ed6c3bcdab0eed14d0e84c76bc48047ccc0ae2a53f06b4284
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://trafficel.ru/wb?keyword=harry%20potter%20hogwarts%20mystery%20cheats%20energy%20ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fd68e3f63db2.pdfIn PDF document text
    • https://site-1210486.mozfiles.com/files/1210486/47566626421.pdfIn PDF document text
    • https://soxokememomoj.weebly.com/uploads/1/3/1/4/131438280/5258018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f900caf02fe1.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/Qjejbjd/wusufaxofovijetoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_5fd75db1655a4.pdfIn PDF document text
    • https://dujinagipufamod.weebly.com/uploads/1/3/4/5/134587046/3496049.pdfIn PDF document text
    • https://site-1084052.mozfiles.com/files/1084052/53085666291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5fb8a59033d18.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/Ngjieid/zombie_jumpscare_call_of_duty.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fdd9b942f830.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/sezewu/the_dead_don_t_die_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/zivalakosemuwimexoxizifir.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/ziveratudatilowovawokiko.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/breaking_dawn_2_tamil_dubbed_movie.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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5472 bytes
SHA-256: 165e806b36d897b918a510aa5a2033310fe3d94515d7029ac012d15f92e12d91
font_01_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 10688 bytes
SHA-256: 24689f0f442848cff843ed3c6a9e3c08b7ed6c54bbe3f53103ea6498d8122895

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