Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17bc26a8fdb17cb…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 19:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5911ee33dc3de3ddbbf586f699337eef SHA-1: 4a1cbfb008c53a4ab05ee094ec17acc01cd5b555 SHA-256: b17bc26a8fdb17cb4c21541b1bed74c5230f9af8ed66931cc3f359ba277c4c9b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results. The primary URL, 'https://ponafet.ru/wix?keyword=sylvia+plath+mirror+poem+pdf', is presented as a search result, likely to trick users into clicking through to malicious content. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or content-luring 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://ponafet.ru/wix?keyword=sylvia+plath+mirror+poem+pdf PDF link annotation
    • http://nutosolawuxa.iblogger.org/xaziji.pdfIn PDF document text
    • http://artyom.guru/alnap_humanitarian_evaluation_guided1935.pdfIn PDF document text
    • http://vuvuga.xyz/43316212445catxl.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/wegugus/7878420404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16bcbaa9-1bf2-4586-a532-bab3eea2cf90/21041052641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ed13d6-8832-4097-9e15-9449cf780cb8/1997_7.3_powerstroke_engine_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952dd9d4-0d75-4537-a8dc-25e71850cb0d/gikegedefijigevake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337f5bcf-ce4e-4938-b83f-546c218c4886/93205068894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7300a9-6d15-443a-8832-b41c90d2890d/sofaxegejuwaginabezegor.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/hp_officejet_pro_6830_e-all-in-one_printer_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ed99ea-47b4-467f-a083-5be4d64bf95d/repalisonade.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_d526c83df7f348bfb07db4a77ba76e0a.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_3d75044ddd8e4676b46b16d8f0e59775.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa77da4-58ee-4556-a421-29593c3ca3ab/vifavut.pdfIn PDF document text
    • http://kiwejepemesifo.epizy.com/77481126391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aab03cd-f94b-49af-bb58-8b3500a3263a/the_grand_inquisitor_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a54a8fe-ba20-48f1-a168-1ca493b2c0a6/7405166528.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/33473428208.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_007a33b295984641b1ec814426283974.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_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 5368 bytes
SHA-256: 674c7e3c24ff8c0b0317451fb32e7536a41ca374059ca7eeb762feeb26d79b36
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 10976 bytes
SHA-256: 0296ffebf31841d6fcaaca3755be7566c40a6aa900d8ae5db9077b5d66c5e801