Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbccbbb22927c67…

MALICIOUS

PDF

85.4 KB Created: 2020-12-24 04:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a7e4ec60a575583bc57ef99ddad03ee4 SHA-1: e56160404fcbaf03029cb0923921130778c35a43 SHA-256: 0dbccbbb22927c67bbd16ba7a48b46c428f6a0f8c365d2e158504a2b19c02487
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains. The document's body text is heavily obfuscated and appears to be a lure, likely intended to trick users into clicking through to malicious content. The presence of multiple PDF_SEO_LINK_FARM heuristics and a high ML score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffe.ru/123?utm_term=gilbert+name+meaning+and+origin PDF link annotation
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/5327430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_5fb61b400d2b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fa4fd0ef393c.pdfIn PDF document text
    • https://nusutena.weebly.com/uploads/1/3/0/7/130739474/3162016.pdfIn PDF document text
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/vumetipow-porivowufisuxit-peril.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5fcc6f2c48a38.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/75de7.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/mudikil-sijabunorotaw-debeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_5fad58f81e6ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fcfb842e3ec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_5fa30cf9b59d7.pdfIn PDF document text
    • https://sudateneturoxa.weebly.com/uploads/1/3/4/3/134322726/2c162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_5fbd04684ba2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_5fbcca1b8a75a.pdfIn PDF document text
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/fa0a3426b1.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/kulinisokakewi/29282298026.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 4508 bytes
SHA-256: aa2eaab55a635f337bbdb264b3c24f4e74b7fa5a28756fda9825121ba768f309
font_01_sfnt_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 4924 bytes
SHA-256: d258f9e065c919be4109776a40b55820f6e62ca87827397359bfe9ea68369e0a
font_02_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 5248 bytes
SHA-256: 2bf41f7b5cc80cb51ba62918e13cd080e3bd6461d0c998964d2ab2b2032753f2
font_03_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 11628 bytes
SHA-256: 0ef77f1af01e1897a8dbbaa1b046a6b485bf02b0bfe5aae5a1e4b651a7c4781f
font_04_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_05_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 6196 bytes
SHA-256: 968ddc40dc261967ccd209506434e0a599c80ff7ef1d183efac68e7901f60c64