Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44abe2126e01b29…

MALICIOUS

PDF

82.0 KB Created: 2021-05-27 10:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b539fa54938d8d24e6eee9bf92b9201 SHA-1: 4a32134d9284932cafad7c39f708a3d56e2fa1c2 SHA-256: d44abe2126e01b29541f218816e8e85093529fca3b571d052006d5dce141c35e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO spam or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, suggesting an attempt to drive traffic to malicious or spam sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=resta+de+matrices+ejercicios+resueltos+paso+a+paso
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/xomubi-xazijilodutipe.pdf
    • https://cdn-cms.f-static.net/uploads/4455405/normal_6060289743843.pdf
    • https://cdn-cms.f-static.net/uploads/4389570/normal_602678898751a.pdf
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fd0d5ed5308d.pdf
    • https://cdn-cms.f-static.net/uploads/4481072/normal_603a8e5c962a4.pdf
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5ffe49f8a75cf.pdf
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/lugikujoxozije.pdf
    • https://guxenakab.weebly.com/uploads/1/3/5/3/135393472/nemup_jaludibipixotom.pdf
    • https://cdn-cms.f-static.net/uploads/4393790/normal_601850ef90862.pdf
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/lifolekiwon.pdf
    • https://cdn-cms.f-static.net/uploads/4426066/normal_5fd62fef1eedd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5c804a52-0995-452b-93c0-d73bc32dc3c3/best_books_on_stock_market_investing_reddit.pdf
    • https://uploads.strikinglycdn.com/files/600a84d9-ab74-4812-9e6e-2432dc304ebc/jiduwudojo.pdf
    • https://uploads.strikinglycdn.com/files/9153473f-8773-4ee0-8f68-dcbdfd4591f9/larepigiz.pdf
    • https://uploads.strikinglycdn.com/files/24973a59-d5e4-449a-9e22-6983c6c4b14a/57508195966.pdf
    • https://uploads.strikinglycdn.com/files/1b3c37d6-cbeb-4d83-9d11-b6c18f12d1e3/99074790986.pdf
    • https://uploads.strikinglycdn.com/files/6c1b4cb2-eeae-4396-9ca4-e835c9b3096f/martyn_lloyd_jones_preaching_and_preachers.pdf
    • https://uploads.strikinglycdn.com/files/ab94146b-623a-442a-998e-a4afc4633a54/how_to_write_an_introduction_for_a_research_paper_5th_grade.pdf
    • https://uploads.strikinglycdn.com/files/6ff7da86-c783-4ebf-85f4-25f0734dd3a6/15319918843.pdf
    • https://uploads.strikinglycdn.com/files/d1a8ef22-a56a-4cb0-b109-49d3616306df/inequalities_in_two_triangles_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/48edb503-f0d1-4a8a-bb3d-3cf180026a7c/dawenaxe.pdf
    • 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_off0000e7ce.bin
9fc6e2e87544a5acf4b085a6c204b1f2a38a71968a6d2f05cf5e28a6c2d630bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 5300 bytes
font_01_sfnt_off0000f9c9.bin
ce30fbd196c22b4c5eaf09816edac77becffc992a002880c80c67d397873cec9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 12560 bytes
font_02_sfnt_off0001235d.bin
ae4c1039909c6b18400a693790947520403f0a9c3cdc5bdc37254682f4165006
pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 16080 bytes