Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a317225a8c6240…

MALICIOUS

PDF

77.8 KB Created: 2021-05-24 23:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0719b8da15610e6431687d8615a5a11 SHA-1: 5311cef441887490377a283e7917aa58fd7a5514 SHA-256: b5a317225a8c6240c6371c1e825f2d1f19b5ddb0497772aaa91e7945b03f0e4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to artificially boost search engine rankings. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=how+to+determine+the+dipole+moment+of+a+molecule', suggests a lure related to scientific information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+determine+the+dipole+moment+of+a+molecule
    • https://static.s123-cdn-static.com/uploads/4405193/normal_5ffb367c1a3ff.pdf
    • https://cdn-cms.f-static.net/uploads/4408343/normal_6061421836e16.pdf
    • https://cdn-cms.f-static.net/uploads/4417029/normal_6050397543ce0.pdf
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/dolutujodu-tukitiba-nutesugapojax.pdf
    • https://vebexedupatad.weebly.com/uploads/1/3/2/7/132740253/dopalef-subonavazumom-boguk.pdf
    • https://cdn-cms.f-static.net/uploads/4410222/normal_6054dd6035b01.pdf
    • https://cdn-cms.f-static.net/uploads/4471692/normal_60586f1d4eddd.pdf
    • https://static.s123-cdn-static.com/uploads/4459170/normal_6007bf96e19b1.pdf
    • https://static.s123-cdn-static.com/uploads/4499002/normal_5fc8cfe491938.pdf
    • https://cdn-cms.f-static.net/uploads/4416928/normal_60346294ddde1.pdf
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5fe0d1bc39783.pdf
    • https://cdn-cms.f-static.net/uploads/4380530/normal_60487b32c3784.pdf
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/bikase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bofake/how_to_draw_for_beginners.pdf
    • https://s3.amazonaws.com/xipavir/sunipimojora.pdf
    • https://s3.amazonaws.com/gedexim/footjoy_golf_shirt_size_guide.pdf
    • https://s3.amazonaws.com/sasufufa/linkedin_advertising_guide.pdf
    • https://s3.amazonaws.com/natewared/transition_words_to_use_in_your_first_body_paragraph.pdf
    • https://s3.amazonaws.com/rewepalazamiso/77841651697.pdf
    • https://s3.amazonaws.com/muxegeza/zanobuxebopemaf.pdf
    • https://s3.amazonaws.com/xovajukoxin/tar._gz_file.pdf
    • 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_off0000ef25.bin
b21e858a9f4e49157c9121076bef6ba1a9f7f87edf735d964a9739f02cd3e7ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 5272 bytes
font_01_sfnt_off000100f8.bin
d40f146a3338c33b1423710f79720b8721b79e954451902120fb0d03eca251ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 12188 bytes

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