Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a66164a5445864…

MALICIOUS

PDF

82.1 KB Created: 2021-05-07 00:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d430221875fb3db7ee23e16c4f60dff6 SHA-1: 2fc1ba7655281119af39ccabeb2847e7282707ff SHA-256: 13a66164a5445864438429c1ccdca9a1f75f88f1a370b6166379885580a847cd
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+use+a+relion+wrist+blood+pressure+cuff PDF link annotation
    • https://cdn.sqhk.co/xidatelo/dtmLAhd/6971453956.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/finaro_jikujunu_sibaguged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_602ec3dcbf9b5.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/fisubedanif.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/6899550.pdfIn PDF document text
    • https://ketijumorowifop.weebly.com/uploads/1/3/2/6/132682879/5deb9604bb6.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/dVRhdhh/63268218953.pdfIn PDF document text
    • https://noxiwufozale.weebly.com/uploads/1/3/0/8/130814513/xemelor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_60330c01807fb.pdfIn PDF document text
    • https://jogojirodatu.weebly.com/uploads/1/3/4/3/134321770/zulakinonozeganenize.pdfIn PDF document text
    • https://jeletaru.weebly.com/uploads/1/3/5/3/135321400/7408531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_606c78f595d58.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
    • http://tumaselopewebu.rf.gd/belajar_coding_python.pdfIn PDF document text
    • http://meziwupagev.epizy.com/d-link_dir-615_t3_firmware_download_2020.pdfIn PDF document text
    • http://gebibem.epizy.com/apc_ups_es_750_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/aashiq_awara_song.pdfIn PDF document text
    • http://faderutapuviki.epizy.com/gepibodibemoxawiresu.pdfIn PDF document text
    • http://muwumatenenuli.rf.gd/11139564600.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/92809410689.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_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 5224 bytes
SHA-256: 90cc3f34a704f906101c0c1dfde866f4c50e8dd93c242665db4d92306e726290
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 11356 bytes
SHA-256: ed19b71869171548fdd286897d2860dabad933ea1982876b257a4a06ca59fb21
font_02_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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