Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf4bcda166ce997…

MALICIOUS

PDF

74.6 KB Created: 2021-03-03 04:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 01902e22d26a04927fc0eb7cc2eba1cd SHA-1: afb2170a018e43221db1ddc803b33e9383f8bca9 SHA-256: ddf4bcda166ce997dc6393794b21d32646043d70d720201d336de0faddc6ed81
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified it as a link farm with 30 external PDF links, some pointing to potentially malicious content.

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://seumenha.ru/wix?keyword=explosion+transparent+video PDF link annotation
    • http://wojurimaxab.mywebcommunity.org/ejemplos_de_minutas_alimentarias_para_nios.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/jjgn8oo/ringtones_country_gospel_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/gcvxqic/52778180388.pdfIn PDF document text
    • http://www19216801.site/new_mini_mastercraft_2020_onlinesvvdy.pdfIn PDF document text
    • https://fitikuwez.weebly.com/uploads/1/3/2/6/132681307/metutudatexekuz.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/gZgeogg/dragon_models_1_6_apollo_astronaut.pdfIn PDF document text
    • http://save50it.info/59942275544wfq2t.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/jehe5SC/57507154211.pdfIn PDF document text
    • http://bedetomime.22web.org/tefoxuzaze.pdfIn PDF document text
    • https://vexifodukegaze.weebly.com/uploads/1/3/5/9/135977609/3447807.pdfIn PDF document text
    • https://bimonodinedijov.weebly.com/uploads/1/3/4/6/134697137/diwidene.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/domalagewazode.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/pippi_longstocking_cartoon_full_episodes.pdfIn PDF document text
    • http://harkateine.fun/adblock_google_chrome_apkakzrj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zirutabu.myartsonline.com/is_the_movie_the_book_thief_a_true_story.pdfIn PDF document text
    • http://rodobokojezaga.epizy.com/fluvial_landforms_meaning.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/90020942211.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/best_stock_broker_for_beginners_in_india_2020.pdfIn PDF document text
    • http://dudakesiburegig.rf.gd/weed_eater_lawn_mower_carburetor_springs.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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 5040 bytes
SHA-256: acc31ac9eef4fed49d21eb6600a151051ab6871b24adc2fe8226dc95c86ffee4
font_01_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 10940 bytes
SHA-256: 597aef0b91df08a6750ee8384eebc79b6da587e5e7fd4f98a3bc736839894e82

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