Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b8d76d24c999b4…

MALICIOUS

PDF

86.0 KB Created: 2021-03-28 12:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 47efe6aeb5ae51a5ffd5442cdc6685cc SHA-1: 7d29fa128cee2a704cb6c29c2951969347696f87 SHA-256: 92b8d76d24c999b4dc6d3495f2b6b74ff8268a01b2ee213e421cd4523d97d953
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to attract search engine traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents. No scripts were extracted, but the PDF structure itself is indicative of a malicious SEO tactic.

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 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.
  • 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://jumiwimov.ru/award?keyword=cazadores+de+sombras+renacimiento+pdf PDF link annotation
    • http://obzorov.site/vikifesj01jt.pdfIn PDF document text
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/gataladamodu.pdfIn PDF document text
    • http://aov.one/97596405112zircv.pdfIn PDF document text
    • http://get3creditscores.info/arslan_senki_saison_1_vostfrs7xp3.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/rokapekejavame.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/748df4.pdfIn PDF document text
    • http://bachanalytics.com/201675109435ihav.pdfIn PDF document text
    • https://lidimegofomizut.weebly.com/uploads/1/3/1/3/131380930/9edbfcc.pdfIn PDF document text
    • http://storeeuro.info/fantasy_football_draft_cheat_sheet_defensive_players0visv.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/ataxia_classification.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://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_c9d5584be9a0425b89561a4d20f4a8ae.pdf?index=trueIn PDF document text
    • http://wurebosuloxu.myartsonline.com/barnes_and_noble_job_application.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/wubeba.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/niviliremagap.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_1e6f5b10665a4542a7fa2a97e2c053f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/xopun_assamese_serial_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/movamolamolaxabaneriv.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/happy_bday_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/what_to_invest_in_2020_robinhood.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_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 5272 bytes
SHA-256: db15305eb0b10fd8f662a1027888a8ed91123576b1a80381c019539bbf161d6a
font_01_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 12876 bytes
SHA-256: 61e16ffdb93fbcf4698a5157d40adc5d61ea4153708b5ca12de4bd8a08d16693
font_02_sfnt_off00013ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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