Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4447189e64fd00…

MALICIOUS

PDF

77.2 KB Created: 2021-05-12 03:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ae3e7da136789b986d2b6ef03bc886c SHA-1: 77aade236e7692356a6f59ce13ad5965c8029ada SHA-256: 1b4447189e64fd00178bf9d0d3d9f022b6efc2570f2860d631bf56e5ed97c9e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=all+in+1+hdd+docking+875+driver+windows+10+download PDF link annotation
    • http://kixinikuzilot.22web.org/bible_journaling_workbook.pdfIn PDF document text
    • https://noxiwufozale.weebly.com/uploads/1/3/0/8/130814513/8319188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_604e884fd48cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_602f5eb67c2eb.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/metabolism_miracle_diet.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/22200903847.pdfIn PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/melerof.pdfIn PDF document text
    • http://femusawar.iblogger.org/61221620456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/platform_picture_full_movie_hd_video.pdfIn PDF document text
    • http://pizodixevefok.rf.gd/jobekalivas.pdfIn PDF document text
    • http://kexofiz.epizy.com/12120720129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea828c6e-54ac-4ee5-baad-864fbebc961a/92369122406.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/2950791463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98afcaf8-f518-402b-814d-8dc8e6f016b9/kelim.pdfIn PDF document text
    • http://fabevax.myartsonline.com/bible_concordance_online_esv.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/80659427375.pdfIn PDF document text
    • http://guvewenif.epizy.com/xamakebosimos.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/joriwefav.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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 6000 bytes
SHA-256: 16c5775cd8b67e5a17a56cf359906f6054faa0dd2d14da778b9c0d46d61b73ef
font_01_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 10548 bytes
SHA-256: 293a38d94067864814d2c2447df6ea8dbf40baf30dfa34c35207471d954ab605

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