Malicious PDF — malware analysis report

Static analysis result for SHA-256 628ec4cfe79d139c…

MALICIOUS

PDF

65.0 KB Created: 2020-12-20 03:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1493c07b80e98a706264151f556305a2 SHA-1: 6b6cd2c43031278ccdd282309b761a8dcce4b7f0 SHA-256: 628ec4cfe79d139c462fc52df8e91a0517382e5876a7c83194f115b6fa578116
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=formato+hoja+de+vida+sencilla+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_5fdb9a9812ac8.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/3135269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5fbe0bc35293a.pdfIn PDF document text
    • https://vapiwoke.weebly.com/uploads/1/3/4/3/134338270/rijugisirevenog.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fusotopajiset.pdfIn PDF document text
    • https://wafebunutixiwi.weebly.com/uploads/1/3/4/1/134109037/9267399.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/datixidekeg_fekiwapozujane_xoziwaxe.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/fewig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfd2a21-aab8-43dd-936c-e842f285ff24/magna_excitor_bike_yellow_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e91dbe-2dad-46d2-848d-e3b0843d0c74/fojipupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70095125-d549-4a65-a8ac-700cc53a6b17/lamogudarekizubirenelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b64f0aa-8002-4ff6-bcb2-a9197ba6a2d2/juego_de_conejos_y_madrigueras.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_off0000c1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A1 5752 bytes
SHA-256: 319038d001c76d3387d9862edf7b7c29ad8e1d07a34334a551db5bd7e65c2024
font_01_sfnt_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10076 bytes
SHA-256: e1aee00a14d2200b70ae6b9bc7e0337bd86ba7d5c32f07069568bb70b3e60dfd

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