Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9333afdb41bf68e…

MALICIOUS

PDF

83.9 KB Created: 2021-04-29 13:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9e3f5e51406037c76516aa1a31699a31 SHA-1: 62a206e3ee6f18167c1f189a1347e1941ace8a11 SHA-256: b9333afdb41bf68e03b5bcaee19881871da36d51eb7e5f75a4a5b08d67798ea9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms used for malicious redirection. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to a malicious site, likely for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://ponafet.ru/strik?utm_term=husky+26+gallon+air+compressor+replacement+parts PDF link annotation
    • https://cdn.sqhk.co/baruduwege/ljfFhhO/best_apple_watch_qi_charger.pdfIn PDF document text
    • http://iclod.tech/xoxatuxuginoza9wbp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_60661a9689482.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/03a8ece13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388813/normal_5fe1f74c023ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5ff5a3fe2232d.pdfIn PDF document text
    • https://geduletulaf.weebly.com/uploads/1/3/4/5/134509924/jasenosazufi-zapuzenepodevas-zebof.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/hhcicVl/22436381293.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/7eca6.pdfIn PDF document text
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/bevaxikog.pdfIn PDF document text
    • http://storeeu.info/fortigate_30d_configuration_guide5ph0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_602795ec24a9e.pdfIn PDF document text
    • https://cdn.sqhk.co/lokileresab/egijahj/69279720334.pdfIn PDF document text
    • https://mipijipibax.weebly.com/uploads/1/3/4/8/134873473/xejirap_semogajukikiful_miruremel_regafumu.pdfIn PDF document text
    • http://urro-hu.com/delete_watermark_online_freeulw7g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_60312e0eb4c64.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/zuxime/leneboworikofonopexox.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_0896b410ad1a4195b228e3380224b48b.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_61826a720be044fb81fed7376684264b.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_a34e519fc0af41c1ac381bf36d481b69.pdf?index=trueIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_ffb02f78d28d43138880f47aa8aff1b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/1173583096.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_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 5668 bytes
SHA-256: 7884ca4eacd6bfa2b3caabe672c9c45473bc48ef9378319f05ea9dc8572a4d07
font_01_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 11972 bytes
SHA-256: 81f4b835ccaa360a315e9fde2d46d74a97778056b8b0c0cabdd30ca2602a2ddc