Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee28067ecfc31e5…

MALICIOUS

PDF

82.9 KB Created: 2021-03-29 22:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 044ca3eacf63b8969f1320ac3a1a6d51 SHA-1: 9d041d5e79912c31d26227d0e09abe557aa95a1d SHA-256: aee28067ecfc31e544630333429b21c626446ad214b5f170938c5fc09c940a98
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of a large link farm, including suspicious URLs like 'https://gimoguvi.ru/wix?keyword=c%25E1%25BB%259D+vi%25E1%25BB%2587t+nam+xanh+%25C4%2591%25E1%25BB%258F', suggests it is used for SEO manipulation or to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/wix?keyword=c%25E1%25BB%259D+vi%25E1%25BB%2587t+nam+xanh+%25C4%2591%25E1%25BB%258F PDF link annotation
    • http://rafale.store/gulilefumikamogidiwyrip6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6013a73e0f28d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_6044dba929daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_600cf22adad2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fed1a1087fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452374/normal_5fdab6cd1dc25.pdfIn PDF document text
    • http://4d-5d.com/analisis_foda_ejemplosjh5yb.pdfIn PDF document text
    • http://good-production18.site/does_tris_die_in_allegiant_movie3wad7.pdfIn PDF document text
    • http://appeal-ig.com/653700628718cz2u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_5b995ad38b294f62a0dd53d89f109408.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7b6725-f2eb-418a-9273-a646cd4df40f/52128664548.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_b12efc913a8c453eb5a353758746df1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/664008bc-ed5d-44fa-a148-33b448c85329/paxuxew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1df9855-84db-44e9-8b37-44e58cf7a164/hbs_share_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed12f63-91c2-4498-b9d4-c76446d74d07/how_to_install_a_broan_vented_range_hood.pdfIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_76bca16c6fe34b26a4fd6dad533c1d9e.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_c99e77719df9456ab6cd0fb54f22dacd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffddb763-ce1e-42df-aa37-64087bfdb2df/do_chickens_walk_around_at_night.pdfIn PDF document text
    • https://4b3c1411-62fe-4b74-ac0d-dad8ff5dd90a.filesusr.com/ugd/d10829_f42cd966d34e497480eeba06c469e9f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90ec5e7-a292-4bce-96b4-9ef8cb75760b/2560866308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3473a617-266e-4b1c-b14a-14eb70dbc0c3/70731481103.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_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 4984 bytes
SHA-256: 7facfbc4bf047be8f5c172fa260f96b735e6a910a31c53e5decebf53c23dd7ab
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 21932 bytes
SHA-256: c6257f4d15ff86563dcf51eb95d3d0d0a8d9a0e206631b5bf6ea65422630117b
font_02_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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