Malicious PDF — malware analysis report

Static analysis result for SHA-256 add0b438b40ccf75…

MALICIOUS

PDF

73.1 KB Created: 2021-03-01 11:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aa2c70e0b261b94a876b33daeaf6815a SHA-1: 25a93ace87e46255ced402383dbbcdeb86f78e67 SHA-256: add0b438b40ccf756620287342949081abca47dd87aa2c1fd6b40c5ee4abdbb3
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs 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-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://jottigo.ru/award?keyword=aircraft+maintenance+salary+in+us PDF link annotation
    • https://cdn.sqhk.co/bomoxale/he3iapa/93295013503.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/lWgg1gf/turbo_intercooler_hose_reducer.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/FtlQhf9/learn_python_3_the_hard_way_4th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/Ghhjjib/51042799809.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/uG5ncia/flights_to_miami_from_detroit_delta.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/6630260.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/ae93c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_600a67fe2f246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5ff3627c31de6.pdfIn PDF document text
    • https://sakavikonur.weebly.com/uploads/1/3/4/8/134854141/mimekunad.pdfIn PDF document text
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/5298505.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/EPVif6w/gluten_free_pancakes_recipes_bob_red_mill.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomufulikade.epizy.com/soda_crack_file.pdfIn PDF document text
    • http://wubixulazig.rf.gd/32109201304.pdfIn PDF document text
    • http://nisogifamesada.epizy.com/ana_anticuerpos_antinucleares.pdfIn PDF document text
    • http://wetegazepi.epizy.com/53615561881.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 5120 bytes
SHA-256: 00e24994746e251235c7abc177f0afdd514269f511a19404325bbef5c88ae89c
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 10352 bytes
SHA-256: 90305233b0ce901a8341140662630c5b5903afd87bc87ed3ac44d00a773ac55d

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