Malicious PDF — malware analysis report

Static analysis result for SHA-256 562067a00c3c62c5…

MALICIOUS

PDF

76.4 KB Created: 2021-02-27 08:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f1f3e02171045a5716218359a747611e SHA-1: 9a275741f0979aa33b62b626379bdc0cd3eac363 SHA-256: 562067a00c3c62c5d5df904c5427bed9bd493d2d5a6bee6df391e2dd92246ab6
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=instrumentos+de+recoleccion+de+datos+cuantitativos+pdf PDF link annotation
    • https://cdn.sqhk.co/lisutovudaf/e5ha3hD/out_of_the_loop_game_hack.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/86314596107.pdfIn PDF document text
    • https://cdn.sqhk.co/nilulugaj/hihdjaQ/steel_panther_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/CidChgb/virgin_radio_top_40_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/c4OheaU/xizujanabotili.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/gavarob.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/laxemoxeje.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/healthy_morning_smoothie_recipes_for_weight_loss.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/why_isnt_my_aux_cord_working_in_my_car.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/fzhcbJJ/jowuguba.pdfIn PDF document text
    • http://mezazasakejel.iblogger.org/zogotibevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidepojedava.myartsonline.com/core_connections_algebra_1_chapter_4_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/rurufoz.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/is_elephant_hunting_legal_in_zimbabwe.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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 5300 bytes
SHA-256: a940cab59a1b3f682e2de4182eeea3ffb98f9cdfab98f7a3e74d001c332efcb4
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 11476 bytes
SHA-256: 8175864313eb68c73eafba0c2886833bbb45ff4c93ca4f12ed4fa98f8439a478

Open this report in the interactive analyzer, or submit your own file for analysis.