Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a6908e1e8ee021…

MALICIOUS

PDF

75.3 KB Created: 2021-03-17 11:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 41e56d46bdf2b7b34673fab579738bc8 SHA-1: f1c63507027a21a85b182e291449cee5af5b1293 SHA-256: 46a6908e1e8ee0218117af3da528b11eab391e211fae7615a9ab5bac91a11335
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to 'https://jottigo.ru/123?utm_term=lagu+ahora+te+puedes+marchar+suju', suggesting a phishing or SEO manipulation scheme. The presence of multiple PDF links on disposable hosting further supports this assessment.

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://jottigo.ru/123?utm_term=lagu+ahora+te+puedes+marchar+suju PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453730/normal_603b61c824e33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422386/normal_5ff0861b9c655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_600f1efa7e4c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5fdc48d9ddf80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_602ee1ed1987e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5fcbbaf69a1a6.pdfIn PDF document text
    • https://cdn.sqhk.co/pivatiwon/9ErSgd6/army_toys_town_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421957/normal_5fdff8909bffc.pdfIn PDF document text
    • http://businessoutsourcing.org/7th_grade_algebra_word_problems_with_answersrovva.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/ixgjVwH/tetris_99_bait_strategy.pdfIn PDF document text
    • http://fabulouss.space/why_wont_my_hot_tub_turn_onl7plz.pdfIn PDF document text
    • http://talakam.space/4626225195lq7uz.pdfIn PDF document text
    • http://lasns.fun/split_complementary_color_scheme_roomm93ho.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/f45hhbG/merge_brawl_for_brawl_stars.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407313/normal_5ff59445ef085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_32d0be398074410bb5eef36ed3037e32.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_3f2d0fcfb4d949bba1ddac1ed091c695.pdf?index=trueIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_ea47e56726cc47e3b813d77f7540a852.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 5200 bytes
SHA-256: 5168eeb0d90f2a7d671c691ac7fd75d91305334b287d0ac8c225cb0b2360d9e6
font_01_sfnt_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 11916 bytes
SHA-256: a080cf3b74ed71dbbe43330c818beaae3c3f92325948906f70f72580c2bf41e8
font_02_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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