Malicious PDF — malware analysis report

Static analysis result for SHA-256 a953b44ab9ef0a53…

MALICIOUS

PDF

71.2 KB Created: 2021-02-10 02:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: eb1e23bf75171157dbe6397c64bc97be SHA-1: 6dc7d07d402890d8864018e92ef623e559e277dd SHA-256: a953b44ab9ef0a5361253ce677ab9aba43a98e957d155f04303643a2c9277bfb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, including one pointing to 'baarspo.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/aws?utm_term=use+of+it+and+they+worksheet PDF link annotation
    • https://zemotererozo.weebly.com/uploads/1/3/0/7/130738962/bagovewupejafup.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/hgmggdd/35330632831.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/UfoQfhg/vanejufumimat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_601b4bab23541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416666/normal_5ff9ab3e3e116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465262/normal_600a0e4f88d9c.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/jbGigyX/mususuwokepamawikefemof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427086/normal_5fde0ed29d465.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/depafuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5fc62fab7bcd7.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/8458016.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/ba08519c886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fatisake/english_bulgarian_dictionary_free_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/crop_rotation_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/mifoxosun.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/budapest_travel_guide_wikitravel.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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 5212 bytes
SHA-256: 8fb97f2fe5bcf562824d32fa9af16207d498bd3f56b63d3dfb948979925b90d8
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 10280 bytes
SHA-256: e14e6f06df8e1b13670d2ef317e70f4de113a5056616e29639b3c5cc739ef8a1

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