Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b702a5f1a18e5c3…

MALICIOUS

PDF

71.1 KB Created: 2021-02-19 22:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 37044b6c38bb8345703dae0caeb730ac SHA-1: 112b488ec392c5ecf145dac53e283599a5eca851 SHA-256: 4b702a5f1a18e5c39e6f0c976f4f3db024efc86429a0ebc2ffc138d22fb392b0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to redirect users to potentially malicious sites. Heuristics indicate this is a phishing trojan, and the ML classifier strongly agrees. The embedded URLs are the primary indicators of compromise, likely leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=the+fix+tv+guide PDF link annotation
    • https://rulesamafov.weebly.com/uploads/1/3/4/7/134768786/8864244.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/785e470.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/20115973475.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/heiehb8/edmodo_app_for_students.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_6013c1a0d3e7e.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/I1jjChg/highway_real_traffic_bike_racer_mod_apk.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/2703167.pdfIn PDF document text
    • https://jikowizovogowo.weebly.com/uploads/1/3/2/6/132682153/ladevojevenuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420907/normal_5ffa1f338f5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_601af2ee649fb.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/1605963.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/eWggnie/toy_race_3d_games.pdfIn PDF document text
    • https://kajipeluvo.weebly.com/uploads/1/3/4/3/134318391/xizoxigu.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/6889352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_6025b42c242ae.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/gelopobovifetalof.pdfIn PDF document text
    • https://sokotomajav.weebly.com/uploads/1/3/4/0/134040389/wagaviwoz.pdfIn PDF document text
    • https://wowaximemufa.weebly.com/uploads/1/3/1/4/131453960/776010e04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godorapibiveze.epizy.com/create_scaled_bitmap_android.pdfIn PDF document text
    • http://moxododokojuke.epizy.com/aroma_rice_cooker_14_cup_manual.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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 4732 bytes
SHA-256: 622eaa0fc77a1de4e0b8475c2ea70e296dbfd317610d7f1e3effffd523a8d86d
font_01_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 10376 bytes
SHA-256: ce6bb3f285e00684e640fc97d04072ac83eafd720a7ec67538cffce1bcf09847

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