Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5e06e991e6da6c…

MALICIOUS

PDF

70.8 KB Created: 2021-02-28 09:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57873cdc2c3b75f7dd9c92cf4530685c SHA-1: bd8dec8c19b2edfa6eb0dc9dc42897f1ea09e25e SHA-256: de5e06e991e6da6c6a8449c2fcffb65ef19ad1ea775f935e99110c4f761ce6a4
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 are to obscure domains and appear to be part of a link farm designed to drive traffic. The document body, though heavily obfuscated, contains what appears to be product search terms, suggesting a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=sharp+cv-p10pc+10000+btu+portable+air+conditioner+ac
    • http://zoo-taxi.site/android_16_speech_to_gohand2ifr.pdf
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/deketezi.pdf
    • http://batut.space/john_gba_lite_app_storenqznr.pdf
    • http://lnstagramverifiedsbadgeform.com/axes._io_hack_apk_modygubje.pdf
    • https://cdn-cms.f-static.net/uploads/4391636/normal_601421c044e19.pdf
    • https://cdn-cms.f-static.net/uploads/4466376/normal_60141fea501b4.pdf
    • https://static.s123-cdn-static.com/uploads/4366354/normal_5fe25c21150f3.pdf
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/8788d72a.pdf
    • https://cdn-cms.f-static.net/uploads/4465125/normal_602960c541d44.pdf
    • https://cdn-cms.f-static.net/uploads/4448713/normal_600fd2fe917cb.pdf
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5ff6bf16ed6f4.pdf
    • https://cdn-cms.f-static.net/uploads/4373243/normal_6031fab2351f5.pdf
    • http://hisgohar.site/tikunoxuys9jr.pdf
    • https://static.s123-cdn-static.com/uploads/4446489/normal_6003422353e28.pdf
    • https://fewirikikekaja.weebly.com/uploads/1/3/2/3/132302896/3384731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tawosutosuxi/electric_scooters_repair_shop_near_me.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_off0000d773.bin
4456000f52ceca05259b51026924e7f5d29669c67cd4731656f6d0514276c0f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 5512 bytes
font_01_sfnt_off0000ea30.bin
6feb440fe58a232ed6f82dc67eaefb62d342aa314b40a6fd114c57c830e66c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 10428 bytes