Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcc3c4422d2eb88…

MALICIOUS

PDF

77.4 KB Created: 2021-06-14 08:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c3bf8f8bcff1b1de6503761e2825dd8 SHA-1: da5995aea21c6170e648b62833948535b64221c8 SHA-256: 2fcc3c4422d2eb88090179cbdda8f823787ea7bf9fe8c28bb4e2f980e387cc09
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on file-sharing services and appear to be part of a link farm. One prominent URL, 'https://pixomot.ru/pbw?utm_term=download+nfs+heat+for+android', suggests a lure to download software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pixomot.ru/pbw?utm_term=download+nfs+heat+for+android
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/bemubogunugedatug.pdf
    • https://static.s123-cdn-static-d.com/uploads/4475866/normal_60b12efd33e57.pdf
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/eb68086d28.pdf
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/duselesozedojozim.pdf
    • https://static.s123-cdn-static.com/uploads/4469386/normal_5fdd86ae3a556.pdf
    • https://cdn-cms.f-static.net/uploads/4426690/normal_602937a4899d9.pdf
    • https://wutomafokusax.weebly.com/uploads/1/3/5/3/135314756/tuvatobitito.pdf
    • https://baxiboxizalitif.weebly.com/uploads/1/3/3/9/133987723/4428793.pdf
    • https://cdn-cms.f-static.net/uploads/4380543/normal_60318b1c8915f.pdf
    • https://cdn-cms.f-static.net/uploads/4423462/normal_6062fc07db8ed.pdf
    • https://cdn-cms.f-static.net/uploads/4475380/normal_60245ce8aa12c.pdf
    • https://cdn-cms.f-static.net/uploads/4485005/normal_60b8af2ca746c.pdf
    • https://ravaratu.weebly.com/uploads/1/3/5/4/135401011/7d698286579.pdf
    • https://static.s123-cdn-static.com/uploads/4446492/normal_5fdf1d0d48f0e.pdf
    • https://cdn-cms.f-static.net/uploads/4481985/normal_6059bfd8b703f.pdf
    • https://static.s123-cdn-static.com/uploads/4495037/normal_5ffa8170ca80d.pdf
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fe80d05205ac.pdf
    • https://cdn-cms.f-static.net/uploads/4480889/normal_5fda771ae3603.pdf
    • https://static.s123-cdn-static.com/uploads/4403260/normal_60037d865625a.pdf
    • https://mitezexevas.weebly.com/uploads/1/3/4/5/134525922/fiwaxejikevite.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6010ceb05ab15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6e2aa18a-552a-491c-8798-4fb4b5d932b9/how_to_make_a_water_tattoo.pdf
    • https://uploads.strikinglycdn.com/files/fac10349-85d6-401f-9a3c-31816e1704bc/94320274784.pdf
    • https://uploads.strikinglycdn.com/files/f404c35b-485f-4866-a735-8f50d92f817d/asus_maximus_viii_hero_bios_flashback.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_off0000e5a8.bin
b37b4e9b887adb3ca0a7234ce1f391c07e7ad67834a542d1ff88544c0e77b765
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 4876 bytes
font_01_sfnt_off0000f63c.bin
f2822ee8af8151bbea1b7ee33437e3e866689e49af53284923659ad8a0688dee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10336 bytes
font_02_sfnt_off00011979.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 4324 bytes