Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3a1dbb65bb77f2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 13:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ddaaa125e6e59b8f34df5236690360b2 SHA-1: 09abf45413d681d7768088d76a67ff3ef0ddd2d4 SHA-256: 3a3a1dbb65bb77f2820655050ff01d299684e66a032a9cfdf185e8f0e65169c2
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious content or software downloads. The embedded document body, though heavily obfuscated, contains references to 'yatse unlocker apk download', indicating a lure for software downloads.

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://botokaw.ru/wix?keyword=yatse+unlocker+apk+download PDF link annotation
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/muneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_60364af8bf429.pdfIn PDF document text
    • https://kuritemu.weebly.com/uploads/1/3/1/3/131383398/gawabiboxole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_604f103677635.pdfIn PDF document text
    • https://xomunulozesini.weebly.com/uploads/1/3/4/0/134018183/2581511.pdfIn PDF document text
    • https://jutarufuro.weebly.com/uploads/1/3/0/7/130775772/6eb59b4cfa0.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/6513598.pdfIn PDF document text
    • https://jifimarug.weebly.com/uploads/1/3/5/3/135319291/d29af62429c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafiwilo.epizy.com/xifalorakexuvazamevug.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_578ce41873d544a5b01e1d164036a4cf.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_820bee16da3640598f69743382952c71.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_74ab460571544d40a7c0be08bbba3dd2.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_22e6b181035d4c7ba3b7fe5151eb7343.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_3294a1f27b5a469aab6f48d0b81811ec.pdf?index=trueIn PDF document text
    • http://nefigubisi.epizy.com/fevimezubipirados.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_bb77a9a200dc4eb49de56f8a4e95e977.pdf?index=trueIn PDF document text
    • http://bireses.rf.gd/29289316685.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_3c57131e99ff4ee7aa3f79d92ff9440f.pdf?index=trueIn 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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 5184 bytes
SHA-256: bee0a567c68cee57de6c8df5b90ce2dab4139b76ffcc5f32e8d1a4f8b6f0f3be
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10620 bytes
SHA-256: f380feed7ab3e01f4fb3befd5f69a24fab858aba07577d9c10c8f18217f0b14d

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