Malicious PDF — malware analysis report

Static analysis result for SHA-256 342a8fa3bbb15729…

MALICIOUS

PDF

71.0 KB Created: 2021-03-20 18:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90146cb9de572fb9dc4735070de6b117 SHA-1: 8ee3961d506315b626c271194089f2b294dbb118 SHA-256: 342a8fa3bbb15729e6842d74aadbf24490da671431fbc42a8a874a94a824c3db
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://jacksth.ru/award?keyword=prosedur+alveolektomi+pdf PDF link annotation
    • http://namafafiteg.mypressonline.com/83447815837.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/7563057283.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/jixivabinewerokume.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/garmin_echomap_43dv_power_cord.pdfIn PDF document text
    • http://miguxinam.22web.org/89285663024.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/safenalavojuwu/57432665239.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f632917a24a74e0ebba25f04e9b195ad.pdf?index=trueIn PDF document text
    • http://nilifujajug.epizy.com/nasukepozetiwagixar.pdfIn PDF document text
    • http://vifewupanog.epizy.com/27005968111.pdfIn PDF document text
    • http://zuronixo.rf.gd/81719457496.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_ae7fdb2c303c46e885f83428d18aad29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93968f7c-4880-474e-be8a-b751a27e18dd/orbital_diagrams_for_all_elements.pdfIn PDF document text
    • http://popirarubinuluk.rf.gd/sinhala_lassana_adara_wadan.pdfIn PDF document text
    • http://nelivizazepafo.epizy.com/casio_mens_tough_solar_illuminator_analog__digital_watch_-_aqs810w-1a2vcfk.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/46749030157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e7255c-2c84-4937-809f-2ec5d534c5b7/24232104273.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/wizijetafazaniji.pdfIn PDF document text
    • http://risexogukif.rf.gd/87041173810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc753f9-562c-4385-8df9-78aa0beb9f0d/41848278484.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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 5312 bytes
SHA-256: 5f6d93c03c3b7ecd44b467b34e2d41e85a71bce1c18cfaebee19b1e893fd969b
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10304 bytes
SHA-256: 9154d5e17d1fa26df2c206783a17e51bfe096460e06bdf87cbf513d0afe74110

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