Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5c6c0cdb144bd8…

MALICIOUS

PDF

150.2 KB Created: 2021-01-05 09:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 94531cbff5873491d164aef6d7762b01 SHA-1: 2804a222c88537f6c33af46a2c803bedb0d72f49 SHA-256: 9c5c6c0cdb144bd890c5fbb6d21a9a3877d9b15d9c0ddb7b82f19634f3f2d895
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also returned a high score. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=nielsen+sweeps+2016+dates+2021 In PDF document text
    • https://cdn.sqhk.co/tinipuded/qUljchi/facetime_international_calls_verizon.pdfIn PDF document text
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/3351055.pdfIn PDF document text
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/f456e9bf8fb9.pdfIn PDF document text
    • https://tetoferapijala.weebly.com/uploads/1/3/1/6/131606168/0509c55d8f58.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/1581635.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/3Asjfgg/kesesemepuna.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/ramupira.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/sedir.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/kiwopusafize/88017159788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f51224-fe80-4eb1-95fc-ee44036dfebf/wipuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0096c0-5ce4-42d4-96b7-2794b11c6242/bukowimalupepuludonerir.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/wavepad_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5076373-ddb9-45e7-8fe7-6b2ddde8f855/girl_scout_world_thinking_day_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aa3154-59c5-4f3b-9c26-eb6954d44b1a/bugonoxiluti.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_off0002067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2067C 5400 bytes
SHA-256: 0fbc1c8a12f9a14e33449ce044922500615cf08a6cea875a99f9aef1be36217c
font_01_sfnt_off00021908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21908 15724 bytes
SHA-256: d7cd8b6397f8ae448c260b648708aab36cd638433b2f91194fae70d7b4af24b8

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