Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3af1a09094c98e…

MALICIOUS

PDF

76.7 KB Created: 2021-01-06 15:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 81263dfd03a1bd3f3b2d7daeddc75dd2 SHA-1: d9ef3d67990372951d2f2fe48112dd5780c526f2 SHA-256: 7c3af1a09094c98e648a6bbd7767018992e022b1f5a84d4ed0b44b31b2189ccf
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://traffnew.ru/123?utm_term=16gb+memory+convert+to+mb', appears to be a lure for users searching for memory conversion information, likely to redirect them to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=16gb+memory+convert+to+mb PDF link annotation
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/fadodiseloz.pdfIn PDF document text
    • https://mepopuwiv.weebly.com/uploads/1/3/4/4/134499337/8fe021570799.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/sapitarorajekefure.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/1959220.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/vonidixubutuwuz_xigojoxomopon_jekabopakiguv.pdfIn PDF document text
    • https://zobuxojakaxux.weebly.com/uploads/1/3/4/6/134690110/mubanelosim.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/795346.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/167463.pdfIn PDF document text
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/2de19.pdfIn PDF document text
    • https://ragenakesigufu.weebly.com/uploads/1/3/2/7/132740294/2c4e438df8055.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/6371156.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/ruter-gejago-tumelipofaw.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/sinamozagemoger/deconstructing_harry_script.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/jungle_biome_rare.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_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 5112 bytes
SHA-256: f7d40facfeb7dbd766e4b865bfb065e0c3189c80d861c86a46a18a4330e256df
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 11316 bytes
SHA-256: 1a966bee4064829e7173be889d63cd55e1d8555c7da29b2b493c961895d270c9

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