Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d4012ce706b497…

MALICIOUS

PDF

84.1 KB Created: 2021-03-29 21:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 710c4d3a48a925a315ac6682c44be45b SHA-1: df8209b0f5ba98e2554a246ff9f2b1a7fce5940d SHA-256: a5d4012ce706b497106d0cb10b850e8dd7773cbc4e49b79e94bdca9ff3563079
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'mechanical engineering colleges in california', suggesting a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=mechanical+engineering+colleges+in+california PDF link annotation
    • http://kafofal.mygamesonline.org/rivatezuvekobufo.pdfIn PDF document text
    • http://hookup666.site/curso_de_ingles_intensivo_houston_txmm24q.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/fhhhUhh/music_mp3_player_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/Putjbge/72364090808.pdfIn PDF document text
    • http://tugeredenazej.mywebcommunity.org/11326351624.pdfIn PDF document text
    • http://mishabelle.ru/11404983621n3bmy.pdfIn PDF document text
    • http://pometukiwalevu.22web.org/93794180556.pdfIn PDF document text
    • http://goduvide.22web.org/pathology_lab_report_software_free.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/0494060b-80f8-4988-9ebe-4f7250a06a58/talozawi.pdfIn PDF document text
    • http://vuzinibijabu.rf.gd/robot_vacuum_cleaner_price_singapore.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_7e92011e19384ab9a28606f5a593c9b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d5040b-6431-4e7c-b4b6-4320a2eb67a5/67854791977.pdfIn PDF document text
    • http://wivowutone.epizy.com/what_bats_are_legal_for_high_school_softball.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/lg_washing_machine_top_load_user_manual.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_1a3d7e1e1c414990b0396415c8da2a5c.pdf?index=trueIn 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_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 5148 bytes
SHA-256: 6089aa2c54b84701cc354b1553bef7450bc398f8f80ac98dbeb11250388141e6
font_01_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 11328 bytes
SHA-256: 0b82704047b1164bcbceee5104631adc989485651ce9fa2306095bdcef62f47d

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