Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd8c1419b399a98…

MALICIOUS

PDF

75.4 KB Created: 2021-03-10 17:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7746707dcf8246fa41126960db6d6716 SHA-1: e04284e473c770511ba8e652ba5f30220a3ff9ca SHA-256: 7cd8c1419b399a9863c9d181f3bb064a7b9152d734584a0c0b0fe117f3348a0b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external links, including one pointing to a potentially malicious URL, supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=on+writing+a+memoir+of+the+craft+review PDF link annotation
    • http://desajegurake.scienceontheweb.net/what_is_a_digital_communication_specialist.pdfIn PDF document text
    • https://guwixuwekolarap.weebly.com/uploads/1/3/2/7/132740580/dadidozaxok.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/fb689.pdfIn PDF document text
    • https://lapidarofo.weebly.com/uploads/1/3/0/8/130874394/nokonudulini.pdfIn PDF document text
    • https://danuxuzajuzawo.weebly.com/uploads/1/3/4/7/134768569/xiridotovisomagar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusopirixalanop.rf.gd/maytag_2000_series_dryer_start_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90c18a0-10ea-42d9-8d0b-da4d2c63f36a/6336977667.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/bm_pt3_format.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/percy_jackson_lightning_thief_book_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e38dc3-70e6-41a7-9e63-a0a707a1aad3/84415017662.pdfIn PDF document text
    • http://jupojef.rf.gd/pozoxerekobuz.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_f25dfcae48134c43a4b6bf8f552fb841.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/596c7436-1a7d-48d2-af87-20ff3631b8d3/44627198267.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/56537932849.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_cae42e1a25e848c8b4a245288a1b9e24.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_407901ed1d2d400bac35d775903c6d8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/62125682706.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/aquarius_man_sagittarius_woman_yahoo_answers.pdfIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_76fd4e0a6e9e4737964629fd93f0f0b4.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5264 bytes
SHA-256: 529007b35fec196404e121fb3cc08a9be467246eefdf2c2fbee66bb54fb8a1a9
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 11220 bytes
SHA-256: beadfb32456b54976d32151092391390f002a6d4c6cd8deb62376230ff07d1af