Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b17f380bdcf189…

MALICIOUS

PDF

74.0 KB Created: 2020-12-09 14:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28c0912904e519400a7f886a1c6fe2ee SHA-1: 3ac75411de2f5a61c4c9b7ce0db5b21ac45c980c SHA-256: a1b17f380bdcf189f8cff3f5c1ed6faddfe0ac883566db38a2b41be97dbd6d42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://traffnew.ru/wb?keyword=solve%20equation%20calculator%20app%20android PDF link annotation
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/sodokazid.pdfIn PDF document text
    • https://rixapozati.weebly.com/uploads/1/3/4/4/134456921/wefedakij_tawidojus_pefevinutawuga.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/3674256.pdfIn PDF document text
    • https://rosiruwolokixa.weebly.com/uploads/1/3/4/7/134765588/cb34c0d60.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/kawixafejesiku-buzadubakelago.pdfIn PDF document text
    • https://nujuwededewomoj.weebly.com/uploads/1/3/4/3/134305400/menixasirasase_gadatobeg.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/dc226df13c86563.pdfIn PDF document text
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/nazexebupurapixugava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc70934a3ccef3526e90d89/t/5fc820d0d6e0cc37e330ba97/1606951120772/33656673931.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/zugedozufologekigamolum.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/julius_caesar_act_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b4dfb5-d637-4b61-ab28-93b81190412d/75053862653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5e0dd7-2c14-4960-9ca6-83f8508daa1d/diluwizorixa.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/risalukunejum.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77bf45c272238a81a68c4/t/5fc8fa3022891c6875ca93d5/1607006768958/pictoword_level_95_answer_key.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_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 5180 bytes
SHA-256: 0204014cdb5f08818a2d816269d95094e287f3759b6df190483342cf177a030b
font_01_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 10552 bytes
SHA-256: 444e935f39814a5d8e78d2dbd629effdde9424fa252c1af2c31ffa58408f2bc0

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