Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb402f717dc5315…

MALICIOUS

PDF

80.3 KB Created: 2021-05-13 10:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a023ba0cd6a6adcc0800c9abdfe609bb SHA-1: 02b111368c7717534efb38ca164a607b2fd02b48 SHA-256: abb402f717dc53152621fb10b81aba00c5611c0c23e0ab51afa33fe05d88db13
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=is+pre+algebra+easy PDF link annotation
    • http://fotonagosuslugi-01.space/19606636872clrg0.pdfIn PDF document text
    • http://kalewolasufer.22web.org/ankylosing_spondylitis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_602e58d0c58bb.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/32934329821f9cmj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_60402fd927958.pdfIn PDF document text
    • https://xuloxaxofe.weebly.com/uploads/1/3/5/2/135294954/rapivimiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_603ead55a562e.pdfIn PDF document text
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/62f4e2.pdfIn PDF document text
    • http://yesnutural.space/microsoft_analyzer_toolufpg1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://wikatamuk.rf.gd/spanish_army_uniforms_1800s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c052bd17-c0da-4b59-b39a-6769f1fd5964/the_classical_music_critic_suffers_the_double_indignity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7542cd1c-36fe-4544-9caf-06fae77590a3/4044789215.pdfIn PDF document text
    • http://muxovunibo.epizy.com/26539796692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c55284d-87d9-4367-a5c3-b14fa33d9db4/how_to_get_a_sentry_safe_open_without_the_key.pdfIn PDF document text
    • http://zesixebejifoz.epizy.com/5th_grade_math_problem_solving_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796c32b5-679b-4b7c-a542-bd929a3ff9fd/5462524247.pdfIn PDF document text
    • http://zuboxevu.epizy.com/brother_in_arms_3_unlimited_money.pdfIn PDF document text
    • http://sozakerikiperoj.epizy.com/vidajiz.pdfIn PDF document text
    • http://giluzufuropej.epizy.com/fesejevi.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 5168 bytes
SHA-256: 3eddfccf19624a88bc349dc31a69997bd0d4a8f2d3b7cd489e87b6b05cf93d42
font_01_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 6068 bytes
SHA-256: 7a02da73c5ff24218d04b188db7d31ceb9303d5dedd43b645f18a615a19d9b6a
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 10588 bytes
SHA-256: ffeef9355210a5b001325be89ded1a2cb9ebfa594eae921ae2d629cfa5c44fbe

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