Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c5cf4702a86d4b…

MALICIOUS

PDF

75.9 KB Created: 2021-02-24 06:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 99845c5e9d386f94c4c94093468df3b6 SHA-1: 21dc750304ea1de894f6c7e6d5b6e6457cba51fb SHA-256: e1c5cf4702a86d4b4a25d482c41905056422a18988e7569be5b5bf0bc79b54ec
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/123?utm_term=mrs.+dalloway+trailer PDF link annotation
    • https://cdn.sqhk.co/bagadogod/bghoejb/linear_regression_calculator_steps.pdfIn PDF document text
    • https://minoximamus.weebly.com/uploads/1/3/1/4/131437876/kafokiledenoxovug.pdfIn PDF document text
    • http://smartycredit.info/559974696422hfaw.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/164335.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/2f979de04.pdfIn PDF document text
    • http://movoxazukum.22web.org/padejisosazar.pdfIn PDF document text
    • https://womukowewefe.weebly.com/uploads/1/3/4/8/134889771/2944208.pdfIn PDF document text
    • http://ximakugimen.22web.org/vidakokomuruwanujirag.pdfIn PDF document text
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/fupokekanox-foduvukolimale-movipigezut.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/jcBhbQU/skyrim_dragonlord_armor_mod.pdfIn PDF document text
    • https://vezejajanobel.weebly.com/uploads/1/3/1/6/131606482/7b51b147dc8f.pdfIn PDF document text
    • https://kazubuxupopa.weebly.com/uploads/1/3/2/6/132696048/821340.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
    • http://kagumaxapa.rf.gd/48820806368.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/95476521635.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/bagurezu.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/netgear_prosafe_16_port_gigabit_switch_gs116_reset.pdfIn PDF document text
    • http://minirulo.epizy.com/airtel_tv_uptodown.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 4732 bytes
SHA-256: b0fa8128761408b2680c29ffac75aff4f2dd0868ec00d033684187faa18f9f6f
font_01_sfnt_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 10088 bytes
SHA-256: c031f375e2169f71ec685747e254e4202201420c05585753f34f1da0c7988fa8
font_02_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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