Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c894f223f5a0793…

MALICIOUS

PDF

77.0 KB Created: 2021-02-26 01:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 647297ce939e61df2a96457f1b6f11c3 SHA-1: ea763775bbd29f57c3c928c6d7b6b72cbabb84f9 SHA-256: 0c894f223f5a0793f13cf2db5441bc092b67d9b9c6537c4c78e11899836daf46
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'audiobook free download', suggesting a lure for users seeking free content. The presence of multiple disposable hosting links further supports a phishing or scamming operation.

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://yafferge.ru/strik?utm_term=the+little+prince+audiobook+free+download+mp3 In PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/gofiwofuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_602196f827d28.pdfIn PDF document text
    • https://tufezojaf.weebly.com/uploads/1/3/1/3/131384552/belikawik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6031591de7d4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fe084cf6578c.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/fixabogoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_602c4fce54048.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/xosekafat_piriburuzulimew.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/lexus_es300h_2020_review.pdfIn PDF document text
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/selerimawodogiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sexikiti.epizy.com/morbidity_and_mortality_rounds_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/awash_national_park.pdfIn PDF document text
    • http://lijazujarakowom.epizy.com/cara_membuat_template_ppt_keren.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5624 bytes
SHA-256: aa9967bc0687477ecbd352bc55dea5c194c8f5e45166011c4c7e2236a59c0ab6
font_01_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 10284 bytes
SHA-256: fc41cfdb3823638a9868c6fc9925c6fa00430c808bc7ccc161be6444e73452fb

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