Malicious PDF — malware analysis report

Static analysis result for SHA-256 5987291df4cca4f5…

MALICIOUS

PDF

69.1 KB Created: 2020-11-13 05:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1af2f6f27ddc1b0361637d4038b1b95 SHA-1: d5065f512828e8d9b945172be44b4e40bdd6aed4 SHA-256: 5987291df4cca4f5e7b1c8e3f4b77e8229db6254824074011aa9795ad081f643
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 pointing to PDFs, suggesting a link farm or SEO spamming tactic. One of the primary URLs, 'https://traffking.ru/aws?utm_term=ibps+po+exam+book+free++pdf', is associated with the malicious verdict. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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-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://traffking.ru/aws?utm_term=ibps+po+exam+book+free++pdf
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5fade3a5ddc64.pdf
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5fa27e2a93533.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/palaj_xofepevez.pdf
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5f953b16d3507.pdf
    • https://fofevupug.weebly.com/uploads/1/3/4/4/134490210/39e7f.pdf
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/4af2623e23864.pdf
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/jeboke.pdf
    • https://semezuzuxikazug.weebly.com/uploads/1/3/4/2/134234688/1142007.pdf
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/juxaponop_tinet.pdf
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5f9766b98e9be.pdf
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/tasave-goreginasifaxib-metuwakoriki.pdf
    • https://teduzagegoxow.weebly.com/uploads/1/3/4/4/134400331/benotuxuz.pdf
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/8bde1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suximawo/93767088885.pdf
    • https://s3.amazonaws.com/tojazudibumogab/rift_leveling_guide_65-70.pdf
    • https://s3.amazonaws.com/xozeb/quantitative_test_for_carbohydrates.pdf
    • https://s3.amazonaws.com/muvojugejoxip/dr_j_kenneth_wallace_dothan_al.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_off0000ce8b.bin
95c40bf412132ce5086a66ace047b21df7e7452e029ca2597fad6db7559ceb4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 5364 bytes
font_01_sfnt_off0000e0b0.bin
d8b414890182e7493d1ef8ec50130c4fd7f8b4db3e92a6ba4ea6a3b770880e5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 11092 bytes