Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a4d3e165718d21…

MALICIOUS

PDF

74.6 KB Created: 2021-03-04 19:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2ac68d1c0eb7b265e8235f04a03b6a87 SHA-1: cc849e427d6851c1513af62f42481ba43f69d633 SHA-256: 59a4d3e165718d21e5e437d9fed37a15e9507bdc28adb339f36d1652e6306dc0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely intended as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://botokaw.ru/award?keyword=how+do+i+use+my+nikon+d3400+as+a+webcam PDF link annotation
    • http://top-salez.site/rusewuxabavija5w2zz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_600ef01f9210e.pdfIn PDF document text
    • http://nazhivy.net/zutotefijulanoxino2524t.pdfIn PDF document text
    • http://sazodiv.iblogger.org/casio_g-shock_ga-100a-7aer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483346/normal_5ffc261422c3f.pdfIn PDF document text
    • http://wasakamow.22web.org/77935590579.pdfIn PDF document text
    • http://homeolimp.com/ravisuxone3wz55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_6015a0ec15015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numikowemenaso.rf.gd/pearson_chemistry_textbook_2012.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_d43dd23d5f4f4af1a2d1e9ff02f32b30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0e9e52-4164-435a-82cd-00971f5643b0/i_got_peace_like_a_river_chords_d.pdfIn PDF document text
    • http://kizuwopo.epizy.com/femme_fatale_tv_series_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05461a4-a5ae-4709-b536-434a3aaaaf8a/32346660737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10578950-2a2e-4716-8c62-91baf904bbc8/fodovu.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_5704e71ced6e4a9fa4a1c8fbe65acfc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f7a558-e9ee-4946-b02e-eaca747c6532/25926210117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a9475a-072c-4d17-a2c0-5c9aea232dc3/kixilefi.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_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 5712 bytes
SHA-256: 0ca2ccf8cbe42a50751ff7381db685a68afd8a6d792ba1139398089d47c09e1b
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 14536 bytes
SHA-256: d38144ab9a49297102e472aa3ac381d1b93bc528718d925873e09ecf58596379

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