Malicious PDF — malware analysis report

Static analysis result for SHA-256 0890798dabf28ed1…

MALICIOUS

PDF

78.5 KB Created: 2021-03-11 23:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a68543efff1b1c07a21312ddbc26cfa4 SHA-1: 4fb6db2edda323cef3ad247edb03ff825c403ff4 SHA-256: 0890798dabf28ed12701d9d6e76949a081cdcfb5373b2cfce9e2d0fdc528ca16
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content or for SEO manipulation. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=amsco+ap+human+geography+answer+key+chapter+15 PDF link annotation
    • https://cdn.sqhk.co/mumaxeje/cKUgCgg/chest_simulator_for_crocodile.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/h9aJPpR/hello_dolly_characters.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/9e045e9c31fa2.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/Lgighjg/lupizexadoxufasutipo.pdfIn PDF document text
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/c9c183c.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/iIMifjd/gokejubaz.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/bosofaputilanuk.pdfIn PDF document text
    • http://miravozexafoxiw.iblogger.org/building_construction_notes.pdfIn PDF document text
    • http://zakababonedip.iblogger.org/b._ed_form_from_ignou_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevewimun.epizy.com/mibuwoguxukaf.pdfIn PDF document text
    • http://rowufug.epizy.com/pudakurajavemijipasiju.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/69291374268.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/speed_queen_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5962fc2-f78e-4208-8b02-d7f5340ef46d/30146879860.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/woxevedofumufadilafis.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/ribonafabufupibo.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/reed_graduate_cover_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/cardboard_sheet_images.pdfIn PDF document text
    • http://mulazukaga.rf.gd/56243759478.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/samsung_j2_2016_frp_bypass_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc089cb-c3dc-48a6-ac2c-abc675535080/wooldridge_econometrics_solutions_6th_edition.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_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 5736 bytes
SHA-256: 0e60a2d98ef4fe4580526c9d95698a8381ebe1f78feff062e3fa7fbee09107ab
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 14732 bytes
SHA-256: 35926f60c23c1d4fe50f421863395c1a3fe6a7f12d6336abab839724021e40ff

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