Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a425b730f5c1277…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 20:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 24b4b25250bf54a8805b216aa1eb4820 SHA-1: d5ebc76401598db15cce7934218a78b958f40d0d SHA-256: 6a425b730f5c1277badb73789934baa18f6f04272db1f557b4ba56e379b70359
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of numerous external links suggests a potential distribution vector for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=farmacos+antiepilepticos+y+anticonvulsivantes+pdf PDF link annotation
    • http://lukiduxipapep.mywebcommunity.org/maze_runner_3_full_movie_123movies.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/61699894779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_604ce5cea28a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_60120883db8e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529087/normal_5ffb5fc8601b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417645/normal_5fdb54da2cb25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lanikudawojag.rf.gd/income_tax_challan_280_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7494dc36-fb93-48b8-acfb-eb6586265129/lg_microwave_lmv1683st_not_heating.pdfIn PDF document text
    • http://fotenataxiw.rf.gd/writing_numbers_in_words_worksheets_grade_2.pdfIn PDF document text
    • http://balazetesu.epizy.com/for_school_uniform_arguments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a32532f-2558-4ef7-b906-48409fd7c552/81877611667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43ad3b5-a51b-4aac-9526-8b29a3d373fa/bipoduwutumuvotisor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40908acc-dd3d-40ca-aa45-59157e3a1b7d/bitimatebesufeja.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_3c0f40c330f44dd88961261abef1839a.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_4223bf0550974b0c843288ddaafb0a71.pdf?index=trueIn PDF document text
    • https://c9107794-7b31-4e5c-84de-5db174abdfaa.filesusr.com/ugd/aabf5f_cd994e8c1b164cb0a16d2d68fde2c33f.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_d939374878b84126b5c5e9d8fca10efe.pdf?index=trueIn PDF document text
    • http://musajaso.epizy.com/liferay_interview_questions_and_answers_for_experienced.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_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 5416 bytes
SHA-256: c6db20a9a3c9982940af7108ecdcab2f0cd177afc7c50155364c3d52cfdf0e3b
font_01_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 12692 bytes
SHA-256: 0356b4654f0cc6c3959e42ba46c595ab4090e0d602213dee3a5cf512e017a6ff

Open this report in the interactive analyzer, or submit your own file for analysis.