Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bb3d30fca4c51d…

MALICIOUS

PDF

78.0 KB Created: 2021-06-07 23:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e449f4bf26517bf3579a8027e4c806 SHA-1: 7c61333ff2c61e7e78de2ea84f2afcc28993cd14 SHA-256: a2bb3d30fca4c51d7d85d4f6fe58521105e7a0c9a295a951523b5289f059c997
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection scheme. The 'SE_QR_LURE' heuristic indicates the document instructs users to scan a QR code, a common tactic for phishing or malware delivery. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest malicious intent, likely involving redirection to a phishing site or a payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dugedepap.ru/123?utm_term=qr+code+barcode+scanner+android+app
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fc71d1d2a658.pdf
    • https://cdn-cms.f-static.net/uploads/4419433/normal_600f2df11b63c.pdf
    • https://static.s123-cdn-static.com/uploads/4452594/normal_5fec7b61b64c6.pdf
    • https://potukogigiso.weebly.com/uploads/1/3/1/4/131407148/1312966.pdf
    • https://sirubiruxegame.weebly.com/uploads/1/3/4/5/134581195/0c5baf44c38fbf2.pdf
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/5872166.pdf
    • https://static.s123-cdn-static-d.com/uploads/4462694/normal_60affab970d38.pdf
    • https://static.s123-cdn-static.com/uploads/4385415/normal_600339935571a.pdf
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/6285360.pdf
    • https://woralolur.weebly.com/uploads/1/3/4/3/134359953/tedizobi.pdf
    • https://cdn-cms.f-static.net/uploads/4471236/normal_6067c8a52a463.pdf
    • https://cdn-cms.f-static.net/uploads/4481061/normal_60b86510729c7.pdf
    • https://cdn-cms.f-static.net/uploads/4403531/normal_6023af03c932b.pdf
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fcbcd1599893.pdf
    • https://wuwuxetu.weebly.com/uploads/1/3/4/8/134897280/talifidoxet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d66de504-827d-450d-b7f9-3b5659a5c495/bissell_powersteamer_pro_deluxe.pdf
    • https://uploads.strikinglycdn.com/files/6852803f-1459-4534-a319-58441f6a75bb/how_to_clean_keurig_when_clogged.pdf
    • https://uploads.strikinglycdn.com/files/b35f0319-3f55-4d5d-bdea-d15fa7b447ed/gevoxudare.pdf
    • https://uploads.strikinglycdn.com/files/5dfa01ca-0be4-4382-b6ec-504cb696a363/mere_christianity_book_1_chapter_3_questions.pdf
    • https://uploads.strikinglycdn.com/files/38d9b490-f0d0-4256-a445-a9ec357397fc/how_to_recertify_food_stamps_online.pdf
    • https://uploads.strikinglycdn.com/files/1a01e283-ef34-4722-9861-d04fdff0a60c/80781781106.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ac.bin
5213d38abad79c090003d4bab6fd8a9924353c71f10cb8dff962f98471342e6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 5236 bytes
font_01_sfnt_off00010479.bin
76ac3f5d564838f9244952982b6543ce8ec2b0905a73217b687080ef195ab330
pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 11192 bytes