Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa16748b9db0bbce…

MALICIOUS

PDF

77.2 KB Created: 2021-04-18 21:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d9c4f7a6de89c2fa1c3bb8342b4bce70 SHA-1: 20e59a186afe0ade146a6fea77e34730bda844fd SHA-256: fa16748b9db0bbce3918b5110f9b4b9768c6e5d914fbff15e96042ed96577e64
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/strik?utm_term=final+fantasy+7+remake+original+release+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386074/normal_6046521c2e12c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_6033f235f0df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_606500c604b42.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/xEXlcia/radodigegoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/uGOkihj/bounce_house_with_slide_rentals_near_me.pdfIn PDF document text
    • http://fb-pageunderreview.com/read_dianetics_online_freev2ruy.pdfIn PDF document text
    • https://cdn.sqhk.co/detobero/LwgdnHX/hit_them_with_the_woah_song.pdfIn PDF document text
    • http://otshelnik.net/4563866488066ecs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_5fd8e701721e8.pdfIn PDF document text
    • http://iglivesupportteam.com/drakor_the_whirlwind_girl_2nwc04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6042c82a9b3e4.pdfIn PDF document text
    • http://mmmmmme.space/baby_krishna_hd_images_freesq7ms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_ee25c7de239c4203b6bd26be32cdc0cb.pdf?index=trueIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_c59f9a493eda4250847b8425f5d06438.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_d81c1b5e28ad48adb2fc4f6a41c3d3ce.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_7a8591c4d41e473f926ef7c6647f4e6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/how_old_for_fisher_price_jumperoo.pdfIn PDF document text
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_69557985ed7b4fe2a59077358e665400.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/billing_statement_template_free_word.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_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 5428 bytes
SHA-256: 89869ef4868747302a22aba43131f27b05d629e6da4dbfaa5f813b6d1b20ef50
font_01_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 10692 bytes
SHA-256: f00eab262b8a2e1eb9ded2af78f541525126c4d40a1c2fb5208ce98ef6fc86e1

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