Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa62ec633c0f5db3…

MALICIOUS

PDF

76.1 KB Created: 2021-01-09 17:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1968607b3742fe7ebed4ee8a48ecdc8e SHA-1: b932d603a87bfc8855683c4fa5f67577c5352c11 SHA-256: fa62ec633c0f5db3051f9bd4b5771c5ed55b5fb9d791ad716a27395508d94a60
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish for information. The presence of a URL with a 'download terraria apk' UTM term indicates a lure for potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=download+terraria+apk+1.3.0.7.8.1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417220/normal_5fe723f45d77c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5fd5f127142d2.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/104a9c5acd.pdfIn PDF document text
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/6904257d.pdfIn PDF document text
    • https://rotafejejulivis.weebly.com/uploads/1/3/4/5/134599198/soxofuxinax.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/bijawixevibo-metamosukes-jekulukiz-tesoromiwi.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/fidelozazawokomisef.pdfIn PDF document text
    • https://semuvufepaz.weebly.com/uploads/1/3/4/5/134597811/fuxisoxiwoviwez_wediga_fawadowa.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/xakapudakadu/answer_key_hssc_clerk_23_september.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3e55c3-b7c4-4910-9dd2-28bba8d88728/60257371793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f6980d-3d9c-4c9f-9f5f-c8640017bb5b/ironwood_tree_picture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece6661d-61fa-47a5-81ca-59336feefd43/5830683285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e90b7a7-69ea-4972-af66-8146efb8451b/jofax.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/js_append_html_template.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_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 5592 bytes
SHA-256: 977778419ff31a3f1774ba62e62e37d33d4477a3ad055fa7b63e55bcb4409fc6
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 11160 bytes
SHA-256: 3fc4237ce863845241b0217e70eccfb2f67bb95cebff488bb52f521b02929452

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