Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea54b44646f10796…

MALICIOUS

PDF

69.7 KB Created: 2021-03-19 03:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 245372a4a0ed2c5e481361fd27749049 SHA-1: bc2f59fcedbb7749aaf125bfb857e2f5e66958e8 SHA-256: ea54b44646f10796c2983e62b00e0db24242e8ce73d1a65b861193e943a82b4b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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://dugedepap.ru/wix?keyword=digiq+dx2+manual PDF link annotation
    • http://extrameets.fun/bakawuruwejajp3s6i.pdfIn PDF document text
    • http://smartline58.ru/746442107595c4a1.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/70aadd910d4d.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/ji9ImzS/91188187150.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/4UOBjgf/bloons_td_5_strategy.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/kilode.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/WggwihR/19627161576.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/5790285.pdfIn PDF document text
    • https://dojenamolusojow.weebly.com/uploads/1/3/4/8/134868247/3832830.pdfIn PDF document text
    • https://walipovagotil.weebly.com/uploads/1/3/6/0/136016519/8630837.pdfIn PDF document text
    • http://qwonder.space/lanubalozekudusilza44w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_10f69076f50c44b7a408621dc2384249.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_8768d04e8106417c9fd4378556553f24.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_2b5edd6e7b32413e92907857ae6c968d.pdf?index=trueIn PDF document text
    • http://mofemofosaxi.rf.gd/third_law_of_thermodynamics_worksheet.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_f9a7b29b3ba8406c9f3ff80dbc00088f.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_367dc8b9f12c4c77b8110ad8cff10dc7.pdf?index=trueIn PDF document text
    • http://zoberutobaf.epizy.com/budisuxizakedafijajitozu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 4772 bytes
SHA-256: 4b4a1285682535460e507382e8773dbe075f9d154112cad2c26d097439d04740
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 10528 bytes
SHA-256: 49e18e9934f59d9a708eef66f67c1f9792b5adc63d7db3876211f43d32cd8ecc
font_02_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3