Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c33c70a12a46fc…

MALICIOUS

PDF

72.3 KB Created: 2021-01-02 13:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 671cbb5a71d4e7022c52f73a0aa197af SHA-1: 22da5887996188b159f5c140e7dc28b919f58dc8 SHA-256: a3c33c70a12a46fc77c01d24199e6393facd6ae901998f71b493c86fda564aff
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body text, though heavily obfuscated, contains keywords related to "California food handlers license answers", indicating a lure to attract clicks. The presence of multiple PDF link farm heuristics and a high ML classifier score strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/aws?utm_term=california+food+handlers+license+answers PDF link annotation
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/025590.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/nifit.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/icH1YG1/fojizugonuvusu.pdfIn PDF document text
    • https://cdn.sqhk.co/dulidara/Knibjiw/pozitowewemowevewimade.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/UlW4oja/wajoxefejabodiguvarike.pdfIn PDF document text
    • https://garituba.weebly.com/uploads/1/3/4/3/134335889/tijef.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/TdZhbdI/numodugofazoladesobufola.pdfIn PDF document text
    • https://degitigurot.weebly.com/uploads/1/3/4/3/134337886/tuzapifexi_zarurotuzeve_denugorag.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/EwjeNhj/invasion_of_poland_ww2_map.pdfIn PDF document text
    • https://kedaregedowe.weebly.com/uploads/1/3/5/3/135321867/zezukefudemarebuz.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/komijatolejon.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/RiaBgjK/gisakufesarog.pdfIn PDF document text
    • https://niritamin.weebly.com/uploads/1/3/4/4/134486676/robaxowisup.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/a4597aaa78062.pdfIn PDF document text
    • https://kezorida.weebly.com/uploads/1/3/5/3/135330530/palutofafibeberofoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 5108 bytes
SHA-256: cdd5b4d6f0125743934575c1a9dc619e1314423d7f74d6d7ac3ad1da6baa379a
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 10488 bytes
SHA-256: 1ab75f7125a6e136fba5e40d68e0376dad1761c0baa76546c1c8afe034583d97

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