Malicious PDF — malware analysis report

Static analysis result for SHA-256 1016e8cc50197144…

MALICIOUS

PDF

70.5 KB Created: 2020-12-19 12:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d84dec07ea9a714cfb6aae0e73b390 SHA-1: 9025dc0b38f04ee44993ebbb5e35b1d9b62d6993 SHA-256: 1016e8cc50197144a00d16c25edb55f317a2ba4e1982dd90dc31d5b38146e9b4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains text related to 'Form 2441 child dependent care expenses', likely a lure to trick users into visiting the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://traffset.ru/aws?utm_term=form+2441+child+dependent+care+expenses
    • https://static.s123-cdn-static.com/uploads/4497658/normal_5fcaa1d2f34ff.pdf
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/e60dde4e4.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/lowigujeruginip_zatoveworokik_togobi_kipemubiw.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/siwosaxazagazija.pdf
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/f1d90ffd3a.pdf
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/5544009.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/burujat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5a99e8ef7301f8b317e6a/t/5fcce525a87f9f1b19d91496/1607263528618/race_rocket_arena_car_extreme_mod_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/feec4ec1-094e-4a3c-8260-4b3b0bc3b2f0/korarifizuvuwibuxesive.pdf
    • https://static1.squarespace.com/static/5fc7856643c5ee75bf2cb04e/t/5fc9f26a41142a3c4b4288f6/1607070314970/free_online_zombie_survival_mmo_games.pdf
    • https://uploads.strikinglycdn.com/files/d4e6aac8-4012-4bdf-81e1-e9415f9fc6cc/fgo_gudaguda_2_rerun_guide.pdf
    • https://static1.squarespace.com/static/5fc52c2f7d0c8f249d5cc2dc/t/5fcce6f5920f47545b941bb6/1607263990294/zezidimevigipasitorozodiw.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_off0000d5e8.bin
6c39ef106a48cab9d53a18f5113f33c5a7f9d7fc34523a47aedca99c8a7a9140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 5608 bytes
font_01_sfnt_off0000e8e0.bin
a6bcbf3571a9f17f0f687d8e5b875d8df4f0a6175fa85c3137f1453ff73ef0f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 10776 bytes

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