Malicious PDF — malware analysis report

Static analysis result for SHA-256 3376f6638e1c750f…

MALICIOUS

PDF

83.4 KB Created: 2021-04-14 01:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 42f46d9a587bf105c2adccf18ea3742b SHA-1: fb1f8a755fcf246406e70a4c3b077ba9ac13569a SHA-256: 3376f6638e1c750f6b0ad8aec75cf1b3e148d8dd2ca34eca803906f2dc7f64d1
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various domains, many of which are hosted on disposable or suspicious platforms. The presence of a large number of links, including those with UTM parameters, suggests an attempt to manipulate search engine results or redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://golowaki.ru/strik?utm_term=how+much+is+a+nintendo+wii+at+walmart PDF link annotation
    • https://cdn.sqhk.co/pizililiv/bZFMvhd/baby_alive_accessories_and_clothes.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/adventurer_activity_book.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/VjVE8Ki/morirurumutile.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/4508089.pdfIn PDF document text
    • https://cdn.sqhk.co/wafexumu/dUX8fEB/hill_climb_racing_2_superbike_cost.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/nolemubozola.pdfIn PDF document text
    • https://pipepixowufoxo.weebly.com/uploads/1/3/1/4/131452867/nixisimidevafe-nerumalugidoxif-petuvojevudir-lelasepowuwodon.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/wodifuvalowapebogotefefos.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/vijinow.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/37308198300.pdfIn PDF document text
    • https://cdn.sqhk.co/pukuwapebo/jcjfhdj/7628687864.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/tigilopudalazu_dakawiwok_senex.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/6thfQ0w/69269334149.pdfIn PDF document text
    • http://rojibitakuvekuw.scienceontheweb.net/50723514201.pdfIn PDF document text
    • http://leledup.mypressonline.com/aqueous_humor_dynamics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e4d01bdc-ab09-45a5-8710-8957238ce951/does_the_keurig_elite_come_with_a_water_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c904476f-f298-409a-a8e7-4cb11d2f7d50/why_is_my_whirlpool_dryer_not_drying_my_clothes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458f887e-2859-4b89-b07a-23578f1574b3/science_crossword_puzzles_with_answers_for_class_5.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/jigifo.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/why_is_my_wireless_headphones_not_connecting.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/companies_check_your_credit_report.pdfIn PDF document text
    • http://nuzirimelosav.epizy.com/blackbird_guitar_tab_free.pdfIn PDF document text
    • http://fanuzisi.epizy.com/perfect_english_grammar_indirect_questions_exercise_3.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 5116 bytes
SHA-256: bd205b327682683ad4ddd07d662bd10b6bc48701fe4d6ff98cdd3366b739402e
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 11488 bytes
SHA-256: 0967a5baaf706df59d7b851fe3fb1f0882be7c6ed0dcd3da1b6a97175c8aff58
font_03_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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