Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafda4a10cf458c6…

MALICIOUS

PDF

81.9 KB Created: 2021-03-29 18:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 846c593ce461e8a69a36e219467d7f2c SHA-1: dd5f99bbb82340d90687c530f3c2d8392ec12e85 SHA-256: aafda4a10cf458c64b2b64283c213d84941f918e89f79f8dec75b6cd088bbc9a
246 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and is specifically flagged for brand-impersonation credential phishing related to Facebook. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to contacting Facebook, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/finojadu.pdf.
  • 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://jottigo.ru/strik?utm_term=how+to+contact+facebook+to+report+a+problem PDF link annotation
    • http://mujododaziwato.scienceontheweb.net/weviwisomarexakisek.pdfIn PDF document text
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/finojadu.pdfIn PDF document text
    • https://cdn.sqhk.co/sobetevod/djdWif9/capture_the_flag_island_codes_fortnite.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/ial3jaD/posilisudusuzubi.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/faa1e9884.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/ditowofejixazulosa.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/77298492800.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/if9tH0x/5029028801.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/ferikosakanutezu.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/fTSjgjg/masidixolizazu.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/zamaxifigij.pdfIn PDF document text
    • https://winiwezunubesu.weebly.com/uploads/1/3/1/3/131379740/8afa561710f0.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/the_chronicles_of_narnia_the_lion_the_witch_and_the_wardrobe_cast_1988.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/c6gjjau/12596775482.pdfIn PDF document text
    • http://bipowilago.mywebcommunity.org/17504476225.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/gfngijA/65357352136.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/how_to_change_home_address_on_garmin_nuvi_50.pdfIn PDF document text
    • http://lumejaramelu.mygamesonline.org/76574497977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4676aa75-c9df-4331-a964-5e6db4d09de3/what_is_the_magna_carta_in_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1347f199-a024-4064-b14e-ebbafa8e1281/38248469944.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/jopozemewexasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0bcda5-2d41-4cbb-970b-db6f06ab11dc/biggest_algorithmic_trading_firms.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_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 5240 bytes
SHA-256: ddccbfbbb8499039caadeee31b1baac01143f988ff54e0a90c18ab9619c093ca
font_01_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 11700 bytes
SHA-256: afacc7e5e0da3d0c423066d01212ed2b425bbaf1cbe5c7a3b2b27f6a5196b7a0

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