Malicious PDF — malware analysis report

Static analysis result for SHA-256 deef822fa37ac94b…

MALICIOUS

PDF

80.5 KB Created: 2021-03-05 04:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3812a258732d907447bfa21adee52534 SHA-1: 60856d3ce896b1e45c713a4386fc8a271ba2bac9 SHA-256: deef822fa37ac94b075549132a2e348a550ef998ba40fb0b042520b66f45cae0
184 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or known redirector infrastructure. Heuristics indicate it is a malicious redirector and has been flagged by a machine learning classifier and ClamAV as a phishing trojan. The primary function appears to be directing users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=pythagorean+theorem+review+worksheet+pdf In PDF document text
    • https://cdn.sqhk.co/kofatuziwu/gXizCBg/tennis_ball_launcher_gun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_600040ff03f2a.pdfIn PDF document text
    • https://fitatopiwize.weebly.com/uploads/1/3/0/7/130739398/9299201.pdfIn PDF document text
    • http://grenkasalo4.xyz/how_to_make_my_smaller_macqhi0k.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/bvlEhg9/experiment_z_zombie_survival_mobile.pdfIn PDF document text
    • https://bivilasafufi.weebly.com/uploads/1/3/4/6/134689398/dcfc6.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/aUficg3/lajebebijevukedugoroso.pdfIn PDF document text
    • https://namevixezevir.weebly.com/uploads/1/3/0/9/130969021/kezuxo-nodoxepitorizu-tilabazovun-jabozim.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/ea0gjhI/flowkey_piano_tutorial.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/3d7a5f160.pdfIn PDF document text
    • http://youla-24.cc/bowflex_xtreme_2_se_home_gym_assemblyfyt8w.pdfIn PDF document text
    • http://all-gopro.com/4695020865j04j3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5fdef64318022.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/bhjjqgf/metahuman_inc_walkthrough.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/votalivumeno.pdfIn PDF document text
    • https://jagefebasedi.weebly.com/uploads/1/3/5/9/135993187/zutakafodugajiwes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mukut/abc_order_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/analogy_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/dilojipal.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/ios_design_guidelines_navigation_bar.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/8066613001.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 5528 bytes
SHA-256: a869df724140ccfc78eaab4a1d93493e8cee03c9a83aa59b3f1bac99823d7bb5
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 10156 bytes
SHA-256: 7fe73ce6572af2cf74f21f29f5ed4e05b48540c1b205f9654058706a5498c725
font_02_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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