Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fdcc9271896eb4…

MALICIOUS

PDF

90.0 KB Created: 2021-04-23 02:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 70efde80258ab1b41c454004648ae469 SHA-1: 83971722ea201fae47d635f6a660f8caf278bf26 SHA-256: 51fdcc9271896eb42c07b20980b1b928859e005cdfebee9d8411d1a4dda263d6
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 0.9991

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://druttle.ru/strik?utm_term=corretor+de+gramatica+ingles+online PDF link annotation
    • http://poguzozod.sportsontheweb.net/soxenakedume.pdfIn PDF document text
    • http://muldwych.com/507479609055tpp9.pdfIn PDF document text
    • http://nuveclovet.xyz/what_are_the_concepts_of_oops_in_javar8s5a.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/JiezLDo/fipumafuturop.pdfIn PDF document text
    • http://klosheff.xyz/jamukufibapulademipiberumoeba.pdfIn PDF document text
    • http://fastgetme.online/family_counseling_theories9hnbg.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/attahiyat_surah_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/ifhcgic/dawal.pdfIn PDF document text
    • http://torchqbfl.fun/fakujokoxunitelj3js9.pdfIn PDF document text
    • http://sale20.site/color_matching_guide54ubi.pdfIn PDF document text
    • http://teleporttur.ru/sepsis_2018_definitions_and_guideline_changes0evnj.pdfIn PDF document text
    • http://ogranicbio.space/gimajefibanurediganosrape2.pdfIn PDF document text
    • http://baugroup.info/38471404126ugo3y.pdfIn PDF document text
    • http://evilcheats.fun/radio_germany_radio_fm2c68xo.pdfIn PDF document text
    • http://leree6.club/risese5icww.pdfIn PDF document text
    • http://trenketo.buzz/37409329545o1yer.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/dstihsp/71052297272.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/f19534cf-081d-43de-bfd1-59fdd661cb85/salujekevek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f3508d-a06b-4b98-8e3d-7188c5a3f83b/how_to_take_apart_a_speed_queen_washer.pdfIn PDF document text
    • http://minivenema.atwebpages.com/how_many_quarts_of_oil_does_a_toyota_sienna_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c433ac-17f7-4eb8-aeff-c6ebad19c1cd/87027037722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eeacb33-2310-46e9-abce-bca125c5e9c6/34625790648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d097c4-f3b5-4863-ae21-faa6d5d15fca/deadlands_reloaded_free.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_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 5164 bytes
SHA-256: 3eb84341aa31d46c78e9330cd5f547bc939182467dd6af6fdbf39da2075e44ea
font_01_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_02_sfnt_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 13092 bytes
SHA-256: a0431038942d378b119754b217e3eab6ba0b6d9e8d6d4b66e11e5bfe31978ca5

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