Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb402c32f0304b14…

MALICIOUS

PDF

82.6 KB Created: 2021-03-17 05:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e1da305f43a64e494a8f46d61b483007 SHA-1: 8f11ee68e5ce8a59cbf8df2931efce9f187b808f SHA-256: fb402c32f0304b14461baef1fc982d27d252a494ddf73e1853a54c52755f1d35
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to attract search engine traffic. The document body, though heavily obfuscated, suggests a lure related to job application syllabus information. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://bologen.ru/award?keyword=bin+sachivalay+clerk+syllabus+pdf PDF link annotation
    • https://womovenurobo.weebly.com/uploads/1/3/1/8/131872055/jolezo-diborowetopob-pepuzamikivu.pdfIn PDF document text
    • http://trujillostacoshop.com/daxajofujogerugizinawomixxkq10.pdfIn PDF document text
    • http://motivawka.online/mobebezalaw3xogy.pdfIn PDF document text
    • http://ritual-venki.online/idle_ants_simulator_gamez5mqi.pdfIn PDF document text
    • http://crystal-light33.ru/gobugakado4o5.pdfIn PDF document text
    • https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/d5e62abb.pdfIn PDF document text
    • http://3bki.ru/16138185539jpti3.pdfIn PDF document text
    • https://nosadipopone.weebly.com/uploads/1/3/4/4/134470180/rejoxe-zabamusogoto.pdfIn PDF document text
    • https://mebusogaduvorit.weebly.com/uploads/1/3/0/9/130969439/2be0f7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/how_to_pair_logitech_k350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c10e5a-a791-4f15-9c84-ee40a9554b3b/what_is_available_on_netflix_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6394dd04-971b-4bec-be0a-492831afefb6/70024836020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd40d60f-71ed-4b25-9841-36d5248d0267/lajujovirabidonepakisun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8423c150-b3e0-4bf1-91e6-cf8b37ed489a/35102434871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b892aa-99df-44fd-a6d8-49004f68f339/72823483147.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/tarivuzuweda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7bf35d-3c3b-4842-86fb-4eef2fee0f5d/z_score_problems_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e45ae30-e080-4771-8121-ace06f43106f/gaxetibupagajatitebiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19402450-8330-40dd-9bec-902a70f15c44/61071547808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a2e8e8-0e99-47c5-afab-dbbb723f1cbc/xojazevojop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f4c3ec-6e31-42ff-b6f5-43323c799d01/86560910397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1b2e17-31ad-4dcd-97ce-f736218ad2af/what_is_patient_safety_in_hospitals.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 5656 bytes
SHA-256: 9b2e4192010701c9d5303b81705570d35bbca972588a67e38c0fac37510a7cb4
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 11084 bytes
SHA-256: 74ed13ed7f255df53a3a8644da65d4fdc2c8437dee2bb3f7e16e4593bce10c53
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16188 bytes
SHA-256: b14e51e28b7353056a2c157a38aed59d0b2d8edf26ca7653faef6002bbd3b691

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