Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c645da47bb2ce41…

MALICIOUS

PDF

78.4 KB Created: 2020-12-25 22:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 313c4b42c174f00b7d13418077d48455 SHA-1: 9d91b5e0c52a411049dcf0d856a95c5ee1bdadcd SHA-256: 0c645da47bb2ce4142c294138ea0c353a2dbcc0d4ceffad7f305b6ef8c092062
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to origami, directing users to a URL that likely serves a malicious payload or leads to further phishing attempts. The presence of numerous external links suggests an attempt to manipulate search engine results or distribute malware through a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/strik?utm_term=how+to+make+an+origami+paper+crane+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5f9c633b238df.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/famufobesuxu-luwutisonigox-vifewudizovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f98ccf19b08d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383689/normal_5fcd7d221d990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5f9991fc4b6b6.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/ZDpigji/nvidia_shield_gamestream_supported_games.pdfIn PDF document text
    • https://kijadixuzot.weebly.com/uploads/1/3/4/5/134585523/daduk-xetoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_5fad637caaf37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f8b2e35027ad.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/hazjjii/n64_emulator_download_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4639d2f7-7033-4b5f-bf92-b2fecb5240a2/kapokir.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/cross_section_of_earth_s_layers_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/zanan.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/61237794778.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/20785786650.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/catholic_reporter_newspaper.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_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 5332 bytes
SHA-256: 85b686b7cee192c56871cb801d34c36930bca32e6bb7a32057e4b582fae3b946
font_01_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 10492 bytes
SHA-256: 5ed56748617a3f9ee4fede66cc8a968c0adbc4279e832bcea319de6e0a791c82
font_03_sfnt_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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