Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc1938cced0a1d3…

MALICIOUS

PDF

82.2 KB Created: 2021-02-21 18:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 955e3e5f926fc92953918404923de770 SHA-1: 7223906c7269087b321ff38234f206e0dca392a2 SHA-256: 7bc1938cced0a1d325c6a6ac20776cb33ee0c340244294b34af0f8bd54d99e7f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/123?utm_term=is+ochem+2+harder+than+ochem+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fce9a37a91d6.pdfIn PDF document text
    • http://autocredit.moscow/botany_books_for_bsc_free3gffc.pdfIn PDF document text
    • https://cdn.sqhk.co/muvenetu/fHocudY/zikoxudezofak.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/fghbPjb/87851634951.pdfIn PDF document text
    • https://wixumiwob.weebly.com/uploads/1/3/0/7/130776296/6322a9472506.pdfIn PDF document text
    • http://steblin.pro/chilling_adventures_of_sabrina_soundtrack_freef82ej.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/jghifM0/reflex_hpv_testing_wiki.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/natotonopogefova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426088/normal_5fdd5f3a035d1.pdfIn PDF document text
    • http://cocobuka3.xyz/desutu62t6p.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxobilan/73icLlw/13310072634.pdfIn PDF document text
    • http://migerov.xyz/25423842634mkrve.pdfIn PDF document text
    • http://eslivdrug.space/98934796437p87u3.pdfIn PDF document text
    • http://swiss-gear.shop/read_royally_lost_online_freers5lf.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://s3.amazonaws.com/fajeloninesitel/11744735376.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/70836423248.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/dadevejazi.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_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 5008 bytes
SHA-256: 6a63041465bc681cc99c281c164ca0779d136aa68841e9b89b0d34dcb50a8ddb
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 10608 bytes
SHA-256: 652e9e8d3e2aa79b74bd445e7aaf12f94c0e44272f20dabe73294ffbe86d3553
font_02_sfnt_off00012d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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