Malicious PDF — malware analysis report

Static analysis result for SHA-256 94115e9838a05d3a…

MALICIOUS

PDF

70.0 KB Created: 2021-02-24 04:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e17e7e5bc63410c220903e3e67f5ef6d SHA-1: 4190e89d41040eec8f28336610a74eee826e88f8 SHA-256: 94115e9838a05d3aef3218fa824463f3af8bb8d0adc40df41b1e9a2e48e8cf3a
244 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs. One URL, 'https://yafferge.ru/wix?keyword=1970+nova+drag+car+rolling+chassis+for+sale', is flagged as a malicious redirector. The presence of many links, including one to a known malicious redirector and others to disposable hosting, strongly suggests an attempt to lure users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=1970+nova+drag+car+rolling+chassis+for+sale In PDF document text
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/af0fdacfc38.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/3aE1gi9/werewolf_bar_mitzvah_full_song.pdfIn PDF document text
    • https://rodadeta.weebly.com/uploads/1/3/5/3/135391988/levukitepufinu_bepotoz_sewazif_wipaf.pdfIn PDF document text
    • http://20970907.net/fundamentals_of_statistical_and_thermal_physics_f.reif_mcgraw_hillebta0.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/PsijJBv/views_subscriber_count.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/8shgjhI/72238662907.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/3828335.pdfIn PDF document text
    • http://bigtittybella.com/car_media_player_baixars451r.pdfIn PDF document text
    • https://cdn.sqhk.co/posuwumujome/nnZidhj/buzuzepopopukomorijenutem.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/KSgfJyw/wipedigefixewivedikoj.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/9204059.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/1iiegOx/aliexpress_set_english_language.pdfIn PDF document text
    • https://fotelixufigowex.weebly.com/uploads/1/3/1/0/131071188/e8f7e.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/bhgzjh1/bogukededikonodokim.pdfIn PDF document text
    • https://cdn.sqhk.co/nezuxada/Sgjhjjh/download_followers_for_twitter_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/xhe2AYo/butamepipuzuziv.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/COieggC/lunimuzitaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezerawe/genadaxipokadexetemuvev.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/how_many_calories_are_in_chick_fil_a_large_fries.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/56760498204.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/29774424467.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_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 5676 bytes
SHA-256: 42a691f3eb7a9f072bce8a8eb1187d55139de492e01ba68e8b4a81f38678e648
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 11120 bytes
SHA-256: d26ac13868cb75bbe5a7bf4b907b0c2a2c4ea49b7fba8cfef3e8ac60012b58f9