Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce92d0c69499b01…

MALICIOUS

PDF

86.6 KB Created: 2021-02-18 01:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8eb16cc2941729ac6e5f41cdb851385b SHA-1: 75be03c4fcf1c06379abc817e7e204affcd83710 SHA-256: 2ce92d0c69499b01e98a43145bbc705312cfe33ff3cfe1ec6bf27b2046dc4d12
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to distribute traffic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The embedded content appears to be obfuscated or corrupted, but the primary function is clearly link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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=short+summary+of+percy+jackson+and+the+last+olympian In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420905/normal_5ff677414b3ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370264/normal_5ffd451e38b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_601b47f965749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_60278f136fe48.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/n5jcibN/nilutimip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_600f553d5012e.pdfIn PDF document text
    • http://wavepolabipal.22web.org/28956018311.pdfIn PDF document text
    • https://duwatazajopi.weebly.com/uploads/1/3/4/2/134235013/mofopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_601161a69ba1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5fea384a11120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_602a44c72a11a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_600d9fe19ab9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litiwevapebani.epizy.com/bleacher_report_epl_predictions_week_37.pdfIn PDF document text
    • http://bemogabidemixu.epizy.com/24393821098.pdfIn PDF document text
    • http://pumejusatojajeg.rf.gd/aafp_feline_behavior_guidelines.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_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 5740 bytes
SHA-256: 65aae8792e16891ebaac1f44550cd9cd1bdd319b998bc2b17633427345097127
font_01_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 9864 bytes
SHA-256: b15de3f3ff5d8ec7902eac722f4b04828e68efbbaa1d59ffbb78c178648b787a

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