Malicious PDF — malware analysis report

Static analysis result for SHA-256 df950a50ac97be90…

MALICIOUS

PDF

77.3 KB Created: 2021-03-18 00:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6daa75939ce571777dbc058367ed882d SHA-1: 7aab66b96d5be68431494793b4626787f2d03317 SHA-256: df950a50ac97be90769b5002225d088b96c6cf33d3409908b872c3c045d730d1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=kn%252Fm3+to+pcf+converter PDF link annotation
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/4249035.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/jbjj78x/xovabopibemizoji.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/SR4Yih8/resizuzatuj.pdfIn PDF document text
    • https://degobevotu.weebly.com/uploads/1/3/4/3/134393677/ca59e81ec2a4e7.pdfIn PDF document text
    • http://gujatun.iblogger.org/free_osha_forklift_safety_training.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/ijWhbOE/moxolepetejepib.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/iievjhz/gudiregegupivabegivux.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/iigeiff/feisty_ferret_cage_bar_spacing.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/gefiaLc/music_90s_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/lemijexo/RGjageQ/dare_you_viral_video_trends.pdfIn PDF document text
    • https://muwudenejudazo.weebly.com/uploads/1/3/4/6/134677543/dulubuwekinereb_famanewupit_goful.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/hiihghj/gipuwizixopivupesiju.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/ieiivuM/short_coffin_nail_designs_2019.pdfIn PDF document text
    • http://migajipanijezep.22web.org/how_to_use_countable_and_uncountable_nouns.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/jDzpidr/pixebixarulame.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/fikof.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/zuwosil/academy_of_management_perspectives_author_guidelines.pdfIn PDF document text
    • http://mutezojujamanu.rf.gd/victoria_secret_catalog_models.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/acceptance_test_criteria_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/77063894285.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/29318525911.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_6f6e5bc5ea5847829316d0993388e670.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falejogajir/what_happens_to_return_to_sender_post.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_5b6ec8f9c6044bcfafcbe029abb23ae4.pdf?index=trueIn 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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 4972 bytes
SHA-256: 18eec5e02dec51b188a76cb460733114bb9e6c98704c766346e0f54efcaf27f0
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 11140 bytes
SHA-256: debc211f498b05ec568ec8244b41db1a226f99c0e86cac1937f9dde49d91932d