Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d85e5e3379200f…

MALICIOUS

PDF

75.2 KB Created: 2021-02-14 22:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 90d1f6b6ead5673aa1a598017fe1c143 SHA-1: ce644ca4067b66ebdea0abfdb82e33fbf0465639 SHA-256: 88d85e5e3379200feed3fcb483ae8ed11910f9dcc5ff0be4ec1a7c651920c293
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to 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://maypoin.ru/wix?keyword=hd+movie+apk PDF link annotation
    • http://frontend-developer-azaynullin.site/black_deck_card_battle_g_gamehackoz0s4.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/iibJiTl/gravity_falls_journal_3_special_edition_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuwitide/WdMvmhd/who_is_the_tin_man_song_about.pdfIn PDF document text
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/kozogepo_rapip_xidoxapezakodi.pdfIn PDF document text
    • http://vnds-super.space/daily_routine_templatesn2mn.pdfIn PDF document text
    • http://smartline58.ru/cartoon_character_drawing_tutorialuxyxd.pdfIn PDF document text
    • http://daisywobzr.rest/smart_cycle_hot_wheels_game7lsc4.pdfIn PDF document text
    • http://lovelid.xyz/zifemanoguwinaxa62536.pdfIn PDF document text
    • https://zojevobe.weebly.com/uploads/1/3/1/1/131163992/pegokakukewon-nusokesemurato-sidis-zomoxevaja.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/hjjmNig/podijukafu.pdfIn PDF document text
    • http://3bki.ru/nomiwagafizodoweberozupamf2jc.pdfIn PDF document text
    • http://moreprodukti.com/list_of_words_and_their_meaningsyhxo3.pdfIn PDF document text
    • http://arm-watch3.club/bipujovononibigij8odmb.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/uhcYhiV/zufakaviwobivero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 4884 bytes
SHA-256: ab70ebe031df09abf8ef4aa7a348dadf620046fd83517f8d6382fcd5623efc3d
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10288 bytes
SHA-256: cf10ebf1bb56bb5e65c9196f5dac5b071c6616297734d0294486ac5acbd729c8

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