Malicious PDF — malware analysis report

Static analysis result for SHA-256 78183b15ff0b36ad…

MALICIOUS

PDF

88.9 KB Created: 2021-03-25 06:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aff3c0af5e67b75148a205e4f37a57f2 SHA-1: 441bd84c26b05ffd1150df5ff4bb48ca144f300e SHA-256: 78183b15ff0b36ada824de1bbff120f4203501cc9c800639b49110f47398ed3d
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure at 'https://yafferge.ru/award?keyword=macam+macam+abnormal+gait+pdf'. The document body is heavily obfuscated, but the presence of multiple links suggests an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/award?keyword=macam+macam+abnormal+gait+pdf In PDF document text
    • https://cdn.sqhk.co/rinugezig/kjdjcji/bajaj_pulsar_150_sales_figures.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/aw5xxgf/troostwijk_auctions_nederland.pdfIn PDF document text
    • https://cdn.sqhk.co/kedetofido/hOikTeY/57808997683.pdfIn PDF document text
    • https://cdn.sqhk.co/tafolaku/ihghdij/14950424045.pdfIn PDF document text
    • http://ideal-it.fun/kijebavuthngtz.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/aBghier/uefa_champions_league_on_tv_in_australia.pdfIn PDF document text
    • http://pipvip.ru/fozupevovinesabevex7lifp.pdfIn PDF document text
    • http://mazers.fun/the_road_less_traveled_book_reportwrv0j.pdfIn PDF document text
    • http://bred-enligne.com/brother_knitting_machine_patterns_ukuez0w.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/jhigeW7/36409288433.pdfIn PDF document text
    • http://gtmedis.com/80094570278gsgss.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/fnCrshd/teddy_roosevelt_shot_video.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://s3.amazonaws.com/nolarifaforuxop/6507908569.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/58987248583.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/buddynice_7k_appreciation_mix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173040a3-ff2b-4874-91e4-943098c97815/lowrance_elite_7_hdi_flush_mount_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0abe9b-ac0b-48da-b75a-def0625d9ebf/fojodiwolodejene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b112b3-14a1-4536-ba27-daa214f663de/nixijuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/35366323635.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/ireport_new_line_in_text_field.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/alan_watts_the_wisdom_of_insecurity_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43790a9-4cd6-4939-b640-8a271886acd9/international_mail_cost_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb954da-ef0b-4c14-b438-861326a7f9b5/73211057878.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 5112 bytes
SHA-256: 4c3ee11579e08a95fc174e2db8e7f97d7e05c1d080f1f06ea91eb6cf6c4cb8c3
font_01_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 10136 bytes
SHA-256: 39919ba8684a2d18e68f02600b178587fb3c73d267ed910891ad7871a9ad49e5
font_02_sfnt_off000147bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e