Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3ecfa3fd392813…

MALICIOUS

PDF

80.7 KB Created: 2020-12-25 13:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ee4588324f3c62ff8d20faba57b09e6 SHA-1: e419c10eab393a930420f05350ae579acf4ab387 SHA-256: 7b3ecfa3fd3928135d6f918d100d739ad13561894fcb1301cc8599ecaad6c130
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. One of the primary URLs, 'https://trafficel.ru/strik?utm_term=amazon+kindle+books+ios', indicates a lure related to Amazon Kindle books, likely to entice clicks. No scripts were extracted, but the PDF structure and link farm indicate 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://trafficel.ru/strik?utm_term=amazon+kindle+books+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388063/normal_5f8f2287ab4e2.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/lilozurezol-fezegegovoxaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5fbdbc037f29d.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/1032423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_5fbeac11d7e72.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/5235645.pdfIn PDF document text
    • https://gomejewenikugi.weebly.com/uploads/1/3/4/8/134869664/6995084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5faaaa8212401.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/finuzixa.pdfIn PDF document text
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/f1247708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_5fb295b55d944.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/6559727.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/midizaxopazeji/alcohol_inventory_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aebc8c73-c2c9-400a-9b21-d906c1f6e38d/11498204671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f5cd1df-5ea6-40b8-80c0-af89e6a7c687/48062203817.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/gakerurodigitivawu.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/21711402870.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 5120 bytes
SHA-256: 2e5a781b7f15141d02892b08c33c0565483f902af4609e29d2f2cb6a920c3041
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 10764 bytes
SHA-256: 889c37153c126a763ca6c36e9f4da7a5568ad746e11a8df766f7c6083a61c37f
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 16964 bytes
SHA-256: 414d2faf63c776ef10382862e6c5ea01a83c3f4b267dc64a737a20c126d90a22

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