Malicious PDF — malware analysis report

Static analysis result for SHA-256 14638ad857571cc4…

MALICIOUS

PDF

72.3 KB Created: 2021-05-22 01:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 562a16f087e50e33b52655478a7cccce SHA-1: 78ea41e58386b65cf834a95e3d5dbe78acc50afb SHA-256: 14638ad857571cc4c703980e2b215ffdc880a446b7608c6926b99a9c7fcfe1ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm. The document body, though heavily obfuscated, suggests a lure related to 'gas pressure in a manometer'. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=how+to+find+gas+pressure+in+a+manometer
    • https://delosixopefo.weebly.com/uploads/1/3/4/3/134344482/kefapulene_powurorit_dogagonilogeg_zureji.pdf
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/2ed71a701c5.pdf
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/518536.pdf
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/9470555.pdf
    • https://cdn-cms.f-static.net/uploads/4452595/normal_606e6fe945702.pdf
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/tapofaki.pdf
    • https://cdn-cms.f-static.net/uploads/4383924/normal_606c3f814ebe2.pdf
    • https://cdn-cms.f-static.net/uploads/4475194/normal_6013bc7fd66ea.pdf
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/9093973.pdf
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/6844975.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vebenok/wf_2630_printer.pdf
    • https://s3.amazonaws.com/vezumobigodub/17077346140.pdf
    • https://s3.amazonaws.com/samopakamefap/conductors_and_insulators_worksheet_5th_grade.pdf
    • https://uploads.strikinglycdn.com/files/c73110b7-d5b6-4ec8-8ccb-a7da7951c402/to_all_the_boys_i_loved_before_3_movie_release_date.pdf
    • https://s3.amazonaws.com/vidadaviwal/79397550663.pdf
    • https://s3.amazonaws.com/zinudipir/volonazumoxefuwogukesezo.pdf
    • https://s3.amazonaws.com/senodiw/zukabufegojotaxurofisarot.pdf
    • https://s3.amazonaws.com/sezebepit/indian_movies_2017_punjabi.pdf
    • https://s3.amazonaws.com/pazatuv/candidemia_guidelines_2015.pdf
    • https://uploads.strikinglycdn.com/files/2e853333-3759-48c3-a8e0-8397520245ba/29408747124.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d083.bin
f6448feeff8c6f9ac708c3bf9a08c29432f342c73464b22ce84bbe7f52228c9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 5264 bytes
font_01_sfnt_off0000e268.bin
b9fe7e5f2a7470e136449cc785eaaa9cfc1bebddf06482c2ad7019213a320100
pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 10224 bytes
font_02_sfnt_off00010570.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 4324 bytes