Malicious PDF — malware analysis report

Static analysis result for SHA-256 984e0a3c4ec92c16…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 01:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a233c72997bfe6dc6d5e93bdccdf95e7 SHA-1: e77f4d5fff49c70bd67314c06544a6ea21c83d21 SHA-256: 984e0a3c4ec92c162361edfdcd9e692fffa863eb3f0ec9140e7bf9a73d0f34cb
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm suggests a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/strik?utm_term=latin+legal+dictionary+pdf In PDF document text
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/4373cd60dd58c.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/igiIx00/queen_chestburster_plush.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/gfzpphi/my_dolphin_show_game_play_online.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/nutaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/c8jamig/shooter_arena_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/cs0xhha/zajodejina.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/eieeQhc/custom_stickers_store_near_me.pdfIn PDF document text
    • https://nofuzuvovakiba.weebly.com/uploads/1/3/1/3/131379181/jokovu_wunegotalukota.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/hdGhjVy/55255694084.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/vghhdii/47517389245.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/gezetega/what_is_the_rage_of_caliban.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/dumuripusuvavovogatizodud.pdfIn PDF document text
    • https://6d1a2d78-ebd2-4140-94a0-411197be5b5f.filesusr.com/ugd/88ff89_e270ff6e44664adc9062b31421182fce.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_34774053de7848b9be15cc60887a481c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/34581394891.pdfIn PDF document text
    • http://lukafimagog.atwebpages.com/wununurikebe.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/jeopardy_template_powerpoint_20_questions.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_792fa48adee841b8bcadc2c12db35e73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/safety_first_infant_car_seat_manual.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_33b0fb082a634692a851767836948fc8.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_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 5188 bytes
SHA-256: b5456f47f91455ad921f7e1906e83b24cca3c74a4ff0a5ee8b054657ccfcec6b
font_01_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 11180 bytes
SHA-256: cbc30a71a15400aecb17b531f8a8dd6cdadc8f9bedbd6b7a88968e5c35b3f0df