Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac10fef11978cd6…

MALICIOUS

PDF

86.8 KB Created: 2021-04-04 12:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 2a01eeb020dc0cb2ebe1140266e39c89 SHA-1: 824305c97d0be1e0ec85bb3a1965af0439eee413 SHA-256: 2ac10fef11978cd6e4ed976bc1e20c4fd540e40a1fd7f33423e95b90137cbd0d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous external links, many pointing to disposable hosting, suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, appears to be related to search engine optimization content, likely intended to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cdn-cms.f-static.net/uploads/4421969/normal_6064e7845096a.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_60138a4c95e89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473064/normal_6003af826855d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_6034812cb2742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_602de4dc19fe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5fc827af249ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd24f79307b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_601ffc6182cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_6067f97199ced.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5fcacde4735de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ff16d39da87e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fe901ca11247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/B9wesDdUo4k/wb?keyword=how%20much%20money%20do%20movie%20directors%20make%20per%20moviePDF link annotation
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_16c9916b93ba4331a1409b082877663c.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_e4ca57e21171486d8fa6dfdc55bbe0c9.pdf?index=trueIn PDF document text
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_9c3eab1e2eb5442d98531875f789496c.pdf?index=trueIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_9d9e3c8900104989917442852f957bad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/20581278666.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_2d5bd547b210488c9c512abf4963b321.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/fanokoza.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_3dd2e0726327401695aa5b5c778c78b6.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_aab48efa03614bde80fc1c5f018138c9.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_ffd6c1a15ac54fefb2859d5103156dc9.pdf?index=trueIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_b002c689ba674808b6c762f226e93cc9.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_9bd60d22e81a457398167d71c3b8bd87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/differential_calculus_examples_with_solutions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 4228 bytes
SHA-256: 6c8200262a9040144acfb81091100487b2d950a6bdc7a468955999b580f1bf57
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 5560 bytes
SHA-256: 1985c7f817aff15f0e730c82c21da1558e1282e30f07814bb50817ca887c6796
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 11352 bytes
SHA-256: ecd72c6a05cedd3256c2d6cf73a886f4173f16c378ae108e2db0e990778457ec