Malicious PDF — malware analysis report

Static analysis result for SHA-256 8313b940136b5363…

MALICIOUS

PDF

81.4 KB Created: 2021-02-20 04:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6d8aa1c9853a58a369cd975e0c875000 SHA-1: d196cc41ecedf55c7255c303c911092f26a593d9 SHA-256: 8313b940136b53631370d6ed0fc79ddd3b54debb761c9856fa5d134e0f4b85c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a significant number of external URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The presence of a URL with 'utm_term=apc+smart+ups+750+instruction+manual' indicates a lure for users searching for specific information, likely to disguise a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=apc+smart+ups+750+instruction+manual PDF link annotation
    • http://shoop-fo.ru/grinch_face_coloring_sheety8nhh.pdfIn PDF document text
    • http://tendernes.ru/linton_primary_school_ofsted_report71quj.pdfIn PDF document text
    • http://bulewedulipofam.iblogger.org/11359657831.pdfIn PDF document text
    • http://metalllift.ru/28268905872ujlew.pdfIn PDF document text
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/jekudizajaduwez-zizone.pdfIn PDF document text
    • http://trokot-online.xyz/nails_of_america_conroe_hoursdff2w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5fd6f33d5909a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_602791bda491a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_602f977375a76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_6028956cdfa2c.pdfIn PDF document text
    • http://meetsalon.xyz/foguwuni85mun.pdfIn PDF document text
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/gedugufe_lapowubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470828/normal_60038e8e612ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5fd97da4b285c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_60209cd8cdb9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://roniderekatitim.rf.gd/dell_ultrasharp_u2711_driver.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 5180 bytes
SHA-256: b0e6671ddc0650a089e590ffc32494e415efe1bd29f800f7eb3830389694bad9
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 11728 bytes
SHA-256: 66c7dfeef540d4534b744ec96ce598e9d9057bf82a7266bf403a439287db5c80
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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