Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71e6a61eacefb03…

MALICIOUS

PDF

70.9 KB Created: 2021-02-14 15:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: efc230deb07cc249ef3b13d2c16bd849 SHA-1: 50184e504e32c96eb2226d653714a539ae76f4ff SHA-256: a71e6a61eacefb03b8fb7f6977ad3bc3c9f63ce3a0b0f94b79dbe0f5d01b6388
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users by directing them to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=y+kant+tori+read+lyrics In PDF document text
    • http://file-id.ru/website_template_for_graphic_designersy669f.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/jhjieD2/85788486055.pdfIn PDF document text
    • http://item-get.top/20172000783yyjpo.pdfIn PDF document text
    • http://pannochki-art.com/gold_runner_alpine_coaster_reviewrmoir.pdfIn PDF document text
    • http://argo-tourism.com/bemawafofaxost3lwo.pdfIn PDF document text
    • http://simcars.ru/vosipozejizisa5lybs.pdfIn PDF document text
    • http://mantenancie.com/excel_2007_advanced_filter_tutorialek7cu.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/w6L2gge/kaditasakowawetinu.pdfIn PDF document text
    • http://stopnutristrike.ru/27272331985wpgdy.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/Gheidhc/shooting_elite_3d_gun_shooter_mod_apk.pdfIn PDF document text
    • https://kawapojironene.weebly.com/uploads/1/3/1/6/131637385/54e5cb7a0d43d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/92433958276.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/hp_envy_photo_7855_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/ralipegidokevoxed.pdfIn PDF document text
    • http://lowakeze.rf.gd/59559564342.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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 5060 bytes
SHA-256: 0ec885df5b3cc1a3aa2cbfb381bcc7b56a33ac9d7048fe6c4252e1b907aeeff5
font_01_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 11072 bytes
SHA-256: fb6e99f12e9af4ce9767cefecc924469f4dcd5022f2d9b8b0e34e86450523759

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