Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c8a36d08680799…

MALICIOUS

PDF

85.0 KB Created: 2021-04-06 01:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d6bfeb31e0d0af74a6a09f108721f1a SHA-1: c69f82f7d1315afcff91e645cb03b2566c32f5a8 SHA-256: 13c8a36d08680799ace6aa0261498afd66a365ccfa6df36a175cde5c3de1987f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, with a specific example pointing to 'http://lalat.space/xuzemv0rpi.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/strik?utm_term=sketchup+warehouse+trees PDF link annotation
    • http://lalat.space/xuzemv0rpi.pdfIn PDF document text
    • http://pagebake.com/epson_workforce_600_ink_walmart03v06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_5fca23e88103e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5feb559eb3e36.pdfIn PDF document text
    • https://wikazire.weebly.com/uploads/1/3/0/9/130968935/8227360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_601649599e37b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_6008e017e764b.pdfIn PDF document text
    • http://bestsaleshopin.xyz/blank_calendar_template_2018p4b9b.pdfIn PDF document text
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/5a6932690.pdfIn PDF document text
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/4049091.pdfIn PDF document text
    • http://hushseo.online/lupagajipfvw1.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/d86b3326.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
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_9f151c4ba6954df1b31c995823fcf3e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/romance_of_the_three_kingdoms_13_cheat_engine_table.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/37335332031.pdfIn PDF document text
    • http://winaputikopavud.epizy.com/5790291563.pdfIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_04a7f524c4974049a24d3d2b7300ebdf.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_970aa56a0abe4e18ae3492f86c3ab928.pdf?index=trueIn PDF document text
    • http://xiwularofevomu.epizy.com/58374547041.pdfIn PDF document text
    • http://rexawisoza.epizy.com/autonics_tcn4s_24r.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_e516aa23ce5f4487b82bafafde655d0d.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_a505d72096f0402f92b2f9646949a249.pdf?index=trueIn 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_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 4976 bytes
SHA-256: 49d9a0725ce148f3c977c3b9b845879c8cd08c09d9c60ae04dcb1827eda9a9a6
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 10716 bytes
SHA-256: 458df9a4b3381225701170a38cf70227a67a55eda7c86256ca79065af437e7d9
font_02_sfnt_off000138a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34