Malicious PDF — malware analysis report

Static analysis result for SHA-256 da82ed12c339fc57…

MALICIOUS

PDF

62.4 KB Created: 2020-12-22 15:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 776af6d9fe92a6ab31633630dea6abb3 SHA-1: d34dd3eb03a4f13519498ab075d8df7ae571c86b SHA-256: da82ed12c339fc5700f480e7df9aa2327578752da4a4094be0170c5036e33291
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=pencilmation+season+18
    • https://sojofemek.weebly.com/uploads/1/3/4/3/134310133/4000205.pdf
    • https://cdn-cms.f-static.net/uploads/4422890/normal_5f96f165620a4.pdf
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5f9cf67d77d09.pdf
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/zudasafil_desasusewoki_nejidutizepo_tavefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf42fb00-75db-405d-b4f1-c869197ac5be/resonance_worksheet_physics.pdf
    • https://s3.amazonaws.com/limepusotanal/professional_resume_template_online.pdf
    • https://static1.squarespace.com/static/5fc67f67ab79f442f2500a09/t/5fce843f619a150f34ef6a90/1607369792235/fexukutuju.pdf
    • https://uploads.strikinglycdn.com/files/77cfd261-06e8-4ab7-b4c8-4b40447f5625/29414477062.pdf
    • https://uploads.strikinglycdn.com/files/4df4da0b-d237-42ec-9644-bd4ee545c59f/36192243864.pdf
    • https://s3.amazonaws.com/nolarifaforuxop/jadobosowutad.pdf
    • https://uploads.strikinglycdn.com/files/13c4a90d-44eb-4762-9a70-32909576db83/vidmate_free_download_apk_2018.pdf
    • https://s3.amazonaws.com/rizezobabub/punaz.pdf
    • https://uploads.strikinglycdn.com/files/e24c5683-7c32-4185-ab91-545a616e92e1/kukun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba46.bin
df377393727845806dba96eae69876cc28d79cd082f82e41444d8b79a8abf910
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA46 5096 bytes
font_01_sfnt_off0000cb8d.bin
fa9a6cd9ef2507b48b5d88c9109158f16586471e3c6e0f217488a9eb277188c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 9856 bytes