Malicious PDF — malware analysis report

Static analysis result for SHA-256 a273c9d2964b1898…

MALICIOUS

PDF

82.9 KB Created: 2021-03-31 09:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d2d713879073bc89a7afbcac0f05829 SHA-1: e024f3f25b62021f329963c849aa4885a4668dc2 SHA-256: a273c9d2964b1898f58f33da49e56930b7bb4ab1bca641d4a727af6f31f86176
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many hosted on disposable domains. The PDF's content appears to be SEO-related text, suggesting a tactic to manipulate search engine rankings or to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/aws?utm_term=what+are+some+instructional+strategies+for+teachers
    • https://static.s123-cdn-static.com/uploads/4375342/normal_5ff32d20e4fdb.pdf
    • http://beduzevitugok.mypressonline.com/sulusul.pdf
    • https://cdn.sqhk.co/worijekegir/yggVjiW/daregowoxakoduri.pdf
    • http://kmikaerfs.ru/nowukaxujemutojac7nvf.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_601de17827948.pdf
    • https://cdn.sqhk.co/naxaroja/bjeuLgh/gupuwewemuvovitijodexeja.pdf
    • https://static.s123-cdn-static.com/uploads/4463788/normal_60030eaabd12a.pdf
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5fcd4175ad067.pdf
    • http://topsol.xyz/vumikupinafoleniwjocg.pdf
    • https://cdn-cms.f-static.net/uploads/4426423/normal_604cb9e859448.pdf
    • http://myfoxing.online/bibodegopururajemucp5v.pdf
    • http://dedaruk.scienceontheweb.net/47299747073.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_83ab2e0af21a4446895c569846049eec.pdf?index=true
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_49ad7f90032a487cac92ac91632788e0.pdf?index=true
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_292657029e144b909cda325497039ac9.pdf?index=true
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_b0169ca82ca349d09f5828aa9d997058.pdf?index=true
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_931b9afc290248cba66f594e95868e60.pdf?index=true
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_b6bd628b27504860a9727f9c2a461eb5.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef9.bin
fbd68f8292a28a08ce873cedf074a7aa1b9d96435a1af7acaa38486de803250a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 5308 bytes
font_01_sfnt_off000100ed.bin
a9895e942d2db47ffeca403b6ec198f17180ab30325a2968f6674478ea407268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 11012 bytes
font_02_sfnt_off0001268e.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 16204 bytes

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