Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8afae250c01d7a…

MALICIOUS

PDF

85.2 KB Created: 2021-03-06 13:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: de18725fba075bc745773c1c6591481d SHA-1: 72718153d41833675e827c22d4ce90b942bfe224 SHA-256: aa8afae250c01d7a555212deba1260249e6a9e4b6f5df9d8527b4e9e824dc044
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, https://golowaki.ru/wix?keyword=hunter+3.3+5+leveling+guide, indicates a lure to a specific topic, likely to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/wix?keyword=hunter+3.3+5+leveling+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378171/normal_6031189d7d285.pdfIn PDF document text
    • http://dusixose.22web.org/15286751313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_601b44838a870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fe749335d747.pdfIn PDF document text
    • http://rufejupewanun.iblogger.org/sopemunukutizurorono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_603e654d0ba9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_5fd30cc69a46c.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/72514262184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_5774dbb47aa44a3ebf057772185bc4b6.pdf?index=trueIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_c3e393a2e9ea466482e503519dda181d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7e9bde-93d8-4301-8b0a-fbefb48ed94d/will_diesel_work_in_a_kerosene_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db011f3c-63c1-4457-be29-4bb781f88121/boxewakotip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70825224-6f8c-4870-8aa7-0a41520303f9/nespresso_aeroccino3_milk_frother_directions.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_ef16f507f0ae4c868d20601052fc82a8.pdf?index=trueIn PDF document text
    • http://rupilozomu.epizy.com/87510535349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df8f3e4-ed2c-48a2-966e-5169da3cd92c/the_master_key_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41280cb-fdf4-4aea-937c-b3d9161e5178/21387408465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07f68eb-853e-466f-ba33-b2c579e7ccd4/how_many_quarts_of_oil_does_a_2008_ford_escape_v6_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffb813f-0846-4fd6-a53a-8293dda8bda1/29917058504.pdfIn PDF document text
    • http://numekup.epizy.com/44668829419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d37121d-2774-4817-a45e-098fac8c6e6f/dark_souls_3_faith_build_2019.pdfIn PDF document text
    • http://ponadimajuv.epizy.com/astm_a572_standard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6edf7453-7efa-4418-aa02-1405cfdc081c/80214138944.pdfIn PDF document text
    • http://zinebozozapi.rf.gd/what_can_disqualify_you_from_the_marines.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_19513842d91f4a318cac6e741eb06726.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 4948 bytes
SHA-256: 39b396581bbf46257175695b6cac1376ed9c4fa82d20d645d639211df65d00e5
font_01_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 15684 bytes
SHA-256: 547c69bec6fb2a34f9953b27c5463be137aded9af9fcc6b1566742c43d042012