Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa1358f34f418b5…

MALICIOUS

PDF

87.7 KB Created: 2021-04-03 18:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f1f6f0fa826ccb08c35e09128d79ef0f SHA-1: dbd4b09deef18fb79b8916258a50b0f8a93dfa7b SHA-256: 7aa1358f34f418b580c595f43b53b04bb2aeb92592dbfd21ecbd2619097506c6
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=philosophy+a+guide+to+happiness+t%25C3%25BCrk%25C3%25A7e PDF link annotation
    • http://3bki.ru/at_t_stock_performancee1jgn.pdfIn PDF document text
    • https://lakafirawitekir.weebly.com/uploads/1/3/4/0/134018328/6ff180042659cc3.pdfIn PDF document text
    • https://cdn.sqhk.co/vujuzira/ejjibh7/best_decks_for_arena_12_spooky_town.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/0jchfia/axel_crusher_toy_machine.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/7491159.pdfIn PDF document text
    • http://ragofilud.medianewsonline.com/angular_5_tutorial_for_beginners_step_by_step.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/3919909.pdfIn PDF document text
    • http://kemytbok.xyz/wujuzomofutozibun9mij.pdfIn PDF document text
    • https://fizabogozof.weebly.com/uploads/1/3/2/8/132815807/fufukukuvax.pdfIn PDF document text
    • https://nomikevokatipo.weebly.com/uploads/1/3/1/8/131859895/ce9d11e5680.pdfIn PDF document text
    • http://austritkfa.com/irulu_tablet_wont_turn_oneqdyk.pdfIn PDF document text
    • http://mastericy-chistoty.ru/81996042877qo8if.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/3041857.pdfIn PDF document text
    • http://teachost.com/keto_summit_free_cookbook_reviewuemu6.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/1186182416241m9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovolefewawex.atwebpages.com/slow_dancing_in_a_burning_room_chords.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/how_do_you_know_if_your_flame_sensor_is_bad.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_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 5692 bytes
SHA-256: b2509c2ad468037ffbd6fbbf588689827740dc5515a85d79773d531f25135451
font_01_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 14056 bytes
SHA-256: 0dbf83cf03068ffa24c5aa90151ad7adee948e1cef182ba112601202e5362686

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