Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e11bef2151b671…

MALICIOUS

PDF

80.7 KB Created: 2021-03-20 13:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3b11fa418214f17b88c67c840652f450 SHA-1: a9677c864f3cb84932c0560f7984747bb5dd2b3b SHA-256: 36e11bef2151b6712944eba86f9810a2c44ff87f71892ea10722a92d6f6c5238
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack that likely leverages JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=samsung+galaxy+s5+active+sd+card+slot+location PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475382/normal_5fe8322c26a5a.pdfIn PDF document text
    • https://cdn.sqhk.co/betarudigi/L4hfWjf/79286776083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_601d786c73e55.pdfIn PDF document text
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/ef06c6.pdfIn PDF document text
    • https://lonexababite.weebly.com/uploads/1/3/1/1/131163854/6321208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470826/normal_5fdda4484f8b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60262054f00cb.pdfIn PDF document text
    • https://dilimeriju.weebly.com/uploads/1/3/5/3/135351787/0b7ab83.pdfIn PDF document text
    • https://kogozifimasubi.weebly.com/uploads/1/3/4/1/134131491/11200659c90.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/xedozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fe780f9f3d92.pdfIn PDF document text
    • https://polopomix.weebly.com/uploads/1/3/4/8/134849819/vodowotimawibaf-peboludek-sujip-lalemikewodage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419192/normal_60042056377a0.pdfIn PDF document text
    • http://golixudib.mypressonline.com/wufufulafojolixutafebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408878/normal_6000161231040.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/vihggW0/juvufubovuwunipavajuxozaw.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
    • https://s3.amazonaws.com/laginekux/alice_miller_prisoners_of_childhood.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/how_many_calories_in_a_taco_bell_bean_burrito.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/leo_tolstoy_three_questions_worksheet.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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 5596 bytes
SHA-256: 6bd3f1c9f6fb373d7a46298334ea3c7cff4af626de1575dce826ec18d7b475d7
font_01_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 11096 bytes
SHA-256: fcc333876f6e0ce2cc61534cd004de9971ca59df1d8ece8aa6d3635f0e208b6e
font_02_sfnt_off000126fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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