Malicious PDF — malware analysis report

Static analysis result for SHA-256 44511a81d6bec468…

MALICIOUS

PDF

88.5 KB Created: 2021-04-03 12:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f3bddfc8768180bee4d4ad005baa417 SHA-1: 71f43198820ab6b877bfe4b8920ee6d50646e402 SHA-256: 44511a81d6bec468faa6f72e5203d970760c251d374ef06d2fba22870bbab006
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/award?keyword=adulteration+of+food+pdf PDF link annotation
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/d8fe4dc68bf0.pdfIn PDF document text
    • https://tawixepew.weebly.com/uploads/1/3/0/7/130739069/6013200.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/5675640.pdfIn PDF document text
    • https://bupifepubeweta.weebly.com/uploads/1/3/4/3/134336259/9de0b0.pdfIn PDF document text
    • http://manovina.mypressonline.com/boy_names_meaning_son_of_god.pdfIn PDF document text
    • https://lefonoduri.weebly.com/uploads/1/3/5/3/135324857/bexegevixaxesa-binelilujudej-sizajez.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/gutuxefasefa.pdfIn PDF document text
    • http://puwinowelin.medianewsonline.com/chenopodium_murale.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/kerakosafatefezala.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/borapurese.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/69588175079.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/ielts_speaking_vocabulary_band_9.pdfIn PDF document text
    • https://xaporavuxeboj.weebly.com/uploads/1/3/2/6/132695407/7691552.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/1003512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dewudirana.epizy.com/does_genie_wireless_keypad_work_with_overhead_door.pdfIn PDF document text
    • http://bosulug.epizy.com/31405286878.pdfIn PDF document text
    • http://kidereludabiron.epizy.com/duxive.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/95300354561.pdfIn PDF document text
    • http://zufomukibataj.rf.gd/lightroom_apk_new_version_uptodown.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/60164299987.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/vimarenela.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/why_did_my_heater_stop_working.pdfIn PDF document text
    • http://furosusuz.epizy.com/pandora_s_box_6_arcade_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/81066525047.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/roblox_how_bad_can_i_be_song_id.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_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 4848 bytes
SHA-256: 8e059d91be893078fd5de93314b840062deaaaedfd1299d3b9fc36d5fe899cad
font_01_sfnt_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 11692 bytes
SHA-256: 109c0abb037fe328f0191d7853d79fa9f2d9937908e9adff19d09c22ddbfed84

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