Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4570a11456dec6d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-28 19:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900b59f672f577523f428830d8921e00 SHA-1: 8920db16bf66540df86a38fdcbc832bb92a1f5c4 SHA-256: a4570a11456dec6dc781adc6eaa08ea24510ef2ff9e6535e62c90dcae9c85294
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=spondylolisthesis+exercises+pdf
    • https://dotijude.weebly.com/uploads/1/3/0/7/130740148/59048cf.pdf
    • https://toxedozopofezi.weebly.com/uploads/1/3/1/4/131453782/suranuzivupupud.pdf
    • https://static.s123-cdn-static.com/uploads/4417023/normal_600985bb7d5e8.pdf
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/sawipimutogik-zikebet-monagivoxodop.pdf
    • https://zobigitesi.weebly.com/uploads/1/3/4/6/134691723/wobokote.pdf
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/tisol-lafulufepo.pdf
    • https://cdn-cms.f-static.net/uploads/4502246/normal_6046644c1d446.pdf
    • https://gibinefofagal.weebly.com/uploads/1/3/4/6/134668975/7111048.pdf
    • https://mopirolelawa.weebly.com/uploads/1/3/4/0/134012876/sarerodaretov-tifojenurepu-sajebarajokev-xajuzulalufis.pdf
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/miwolajeg-tozozevosixubaj-dorageguv.pdf
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/9934716.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gisujubolidine/warhammer_40k_8th_edition_download.pdf
    • https://s3.amazonaws.com/rebomedug/38534931407.pdf
    • https://s3.amazonaws.com/dugibabafod/marketing_mix_free.pdf
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_396e71567ecd42769cd0f427a0ef3f0d.pdf?index=true
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_c72aa9d316d44db59be41f3dab1eb02a.pdf?index=true
    • https://s3.amazonaws.com/livivuvuwugeb/fundamentals_of_microelectronics_1st_edition.pdf
    • https://s3.amazonaws.com/godoremitiwuja/interior_design_styles_guide.pdf
    • https://s3.amazonaws.com/rizoli/57952766540.pdf
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_81d4fbbed48a49b4879cb66599f04999.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed06.bin
15fec4db80797bd58259fbcececd8c8289f466a17e01dd7e4e2099c244e3872d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 5308 bytes
font_01_sfnt_off0000ff22.bin
da10dd58563a66b0aa781a1771f3abe0dc97b7748870771c059e83b97c16074e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 10216 bytes

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