Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78e48a0585394c1…

MALICIOUS

PDF

79.6 KB Created: 2021-04-03 04:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cd9b7fc5f3006a98a58a211d4a2310cc SHA-1: aadd2908f00df88ec7fa7c0ffb88a688bda9d7fa SHA-256: a78e48a0585394c166b66d269cfab52a672e2e0e0f665897f87ff88e2e6e523d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/wix?keyword=onkyo+m+5010+amplifier PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5ff5e8f9e2b08.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/xakeb.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/vuxugebovi-selozovu.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/oKifjfJ/pefezoba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff63407d198a.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/WjehiFE/gangster_new_crime_mafia_vegas_city_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowatu/Nhgjjji/tejuzaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_603d981ae7951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_604fa8489ddf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumametewarad.rf.gd/rock_band_4_all_songs_cheat_xbox_one.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_fc1f6e2c6efe44b38c22e5e689e600d8.pdf?index=trueIn PDF document text
    • http://gevosumol.epizy.com/how_many_carbs_in_taco_bell_frito_burrito.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_685e11227e36454e9bde6d410a1bd87f.pdf?index=trueIn PDF document text
    • http://gafibis.epizy.com/the_economist_magazine_august_2020.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_1f659a598854487c97e54031e79d8616.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_a47cb3185ab34412acbe0e0b35b8ab46.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_ea95d5d8b5a547e7b620cfd713cd01f3.pdf?index=trueIn 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_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 5380 bytes
SHA-256: 1708ccdab361d7ee012496e830cfea85252030e97ecdba0b3434c3ae2f1297d3
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 12436 bytes
SHA-256: 6fc3bd373fd2ca33769cdd5b1febed8485d6e374e55c84316326d0e0ca174365

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