Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51f07f656fd60b4…

MALICIOUS

PDF

112.4 KB Created: 2021-03-12 12:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cc758e0b9b7a3f6f7e859962bffb9d58 SHA-1: 113434a0e086af4f0f551bd927ffc9d59e38744b SHA-256: b51f07f656fd60b42400de8eb0098fbd1ff3e15bf8172b3b4ac75e5f00764a0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to unknown or potentially malicious domains, suggesting a link farm designed to redirect users to malware download sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

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
  • 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://xajibur.ru/award?keyword=standard+deviation+and+variance+formula+pdf PDF link annotation
    • http://evilcheats.fun/23919856373ztci7.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/0idWJHs/38963306592.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/gcx14de/horizon_treadmill_reviews_2019.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/amsterdam_transport_map.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/9ihdhb3/redbox_locations_nearby.pdfIn PDF document text
    • http://zhk-rekord.info/8040940598835on1.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/35668886618.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/Sijhcjg/saltwater_fish_tanks_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/wXjjctc/jubezogup.pdfIn PDF document text
    • http://accueilcmb.com/mupuxarukatitoduxaqaa1f.pdfIn PDF document text
    • http://pet-guru.shop/tagasivadzbgf.pdfIn PDF document text
    • http://nebuxopav.mypressonline.com/linux_shell_scripting_tutorial_free_download.pdfIn PDF document text
    • http://gifazat.iblogger.org/75216350474.pdfIn PDF document text
    • http://erogan-oficial.site/yamaha_01v96_driverwde5u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8536374-5d1c-4026-9f4b-77fa2c1f23cd/leadership_enhancing_the_lessons_of_experience_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d45c9c9-6ea8-4789-b05c-2751ee7f2a72/lenojeri.pdfIn PDF document text
    • http://penefilagew.epizy.com/dress_down_day_meaning_in_french.pdfIn PDF document text
    • http://widitedofirok.rf.gd/vafujerusosozotetovej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d175682-0e29-4069-8869-1617232518d4/45062886136.pdfIn PDF document text
    • http://bexobiku.epizy.com/wataxuwafafaxibez.pdfIn PDF document text
    • http://mijitililifi.epizy.com/10125853541.pdfIn PDF document text
    • http://bekonoxidolu.rf.gd/what_are_the_physical_features_of_ancient_greece.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15746 5284 bytes
SHA-256: 4489ab5ff143d2eb71a65d81da12589f043e9a966f6ea0eb759d91b8d8ae8de0
font_01_sfnt_off0001693a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693A 16692 bytes
SHA-256: 6f1cdaedf45f622ba9092c086e5e1739ae3b2de82b560d6ab68a0105328aafd7
font_02_sfnt_off00019e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E65 16228 bytes
SHA-256: 5b9a19a07c5463111ced19bc9637d821a8630d127d7dc7efedf703003b331dac

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