Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d7cb2a67bb7a50…

MALICIOUS

PDF

80.1 KB Created: 2021-03-23 00:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0a5d6f0e28901e819e14ed79ed64e4d9 SHA-1: 10fbd722fc2d2afc27026a9f6e9028f86e315c02 SHA-256: 28d7cb2a67bb7a5033fc41fdd06ab393c3cf7f37a369fddff9173d2866c28fa4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://fokemale.ru/wix?keyword=taylor+9847n+digital+thermometer+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5fdd3a60d4ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_6016df82e8076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374371/normal_5fcad4851df8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491157/normal_605919e1b4106.pdfIn PDF document text
    • http://dobanojuwelog.22web.org/bebedakitapasadireva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5fec44cd6640c.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/6wa1jdq/download_dancing_line_2_mod.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/deformers_trophy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/G04hhic/kexarawenogujiti.pdfIn PDF document text
    • http://kovemiwixipogaf.66ghz.com/drdo_ceptam_07_notification.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bogijexu/debiwuriz.pdfIn PDF document text
    • http://litopuputorer.rf.gd/jotuxabofineko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a237938-40d8-4a7b-927b-c25b5051fc07/what_is_your_tsp_account_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a814333-28aa-4160-aec9-49571b99495b/good_chess_app_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/vixuj.pdfIn PDF document text
    • http://kipijitifexus.epizy.com/92327179738.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/sims_3_sunset_valley_renovation.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 5632 bytes
SHA-256: 21236ec24958feeab4ed7d26332b246116cd9aa633a0dcb7ecd740bcdf5c7e5f
font_01_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 11468 bytes
SHA-256: bebfd4f288bcfa63bfb1b96d2a834c155e7f0efeca79e10d108cfcdf19e43d0d

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