Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e29840abc1d1197…

MALICIOUS

PDF

78.6 KB Created: 2021-02-24 21:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8013270801096eac372880ba929627c1 SHA-1: 4e6adaddfc64335c743d201914a42c07b57d13f5 SHA-256: 2e29840abc1d11973796127f752deea97d5b41664c633884ecdd7f4b49d05f3a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are flagged as redirectors to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=line6+helix+lt+specs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_6016fe82a1a62.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/Aibgeja/noguxamizavupugujidefume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_602eb30b4adf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd0f32e70840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_5fe9e996c1f63.pdfIn PDF document text
    • http://wolotalute.iblogger.org/22122679882.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/im5hiNE/field_hockey_defending_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/ITiihdJ/mongol_empire_conquest_timeline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483586/normal_5fcc4906723c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5fcfb7e86f6bf.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/vPFjdjh/toy_soldiers_1_32_scale.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/barber_shops_open_on_mondayadymi.pdfIn PDF document text
    • https://cdn.sqhk.co/zereseful/jbjhpib/v_movie_prime_video.pdfIn PDF document text
    • http://gratoraama.space/97861076966u25iw.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/ahiMjaZ/realtime_subscriber_count_kyo_quijano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378845/normal_6005a1727335a.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/hfsChhf/lolukikorinadodusufa.pdfIn PDF document text
    • http://tumbochka.space/campbell_ap_biology_11th_editionmblmt.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/Xl2wNQQ/xuxopagaze.pdfIn PDF document text
    • http://golden-bridge.pro/85295640717cm0l3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_5fe99e2357aec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 4876 bytes
SHA-256: 35804dbc6e4d3b8f6b9fb528d699ca9be2ec675c1921b817b90da61ed257407d
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 11296 bytes
SHA-256: 3cb778567087ee87fa6343f6c6615f59829c5f64149cce0d144f7d8a71ba7c10

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