Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba023529cd3d8916…

MALICIOUS

PDF

74.9 KB Created: 2021-01-15 12:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f1999bdda2bb0b9f398a52cf82547c78 SHA-1: e87b6c554510bc87eea82a3fe3b2b5e05c1614b7 SHA-256: ba023529cd3d8916f345132764cef61de13bea194d0a55fe800cbef6f981a6b7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous external URLs, with a primary URL pointing to 'trafftec.ru' and others hosted on disposable domains like 'weebly.com'. The document's content, though heavily obfuscated, suggests a lure related to 'Uber background check consent form' to encourage users to click these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=uber+background+check+consent+form PDF link annotation
    • https://xodimiteti.weebly.com/uploads/1/3/0/7/130776847/vizukutigejil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375075/normal_5fe565bc4cb17.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/jhgeO2R/wilejerijadivedoxiwerowom.pdfIn PDF document text
    • https://dowikawi.weebly.com/uploads/1/3/4/7/134741621/xalizafonimupet_makowubu_dubir.pdfIn PDF document text
    • https://serofijukepaba.weebly.com/uploads/1/3/4/6/134693026/xamudotavu.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/242547.pdfIn PDF document text
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/jowodomok_tifenamip_lunetenibabuko.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/nazekisigiduz/attendance_allowance_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/lesson_4-_3_congruent_triangles_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/1990680502.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 5596 bytes
SHA-256: fad96812878da5670fe9385556cc2548a35fe057fa70c7089aade34669e6601e
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 10592 bytes
SHA-256: e9e69aabe9ef095011d08f4d780aebcfd6034bd31fd2642418565e3acfb950d1

Open this report in the interactive analyzer, or submit your own file for analysis.