Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe01562e5be88ee…

MALICIOUS

PDF

85.6 KB Created: 2021-03-31 04:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 11acacca630e1a6dc52e9fbc8ef8372e SHA-1: cd046a584502f99a16e20fd4329bf5e24869b7d5 SHA-256: fbe01562e5be88ee575ea7629a50b0093e617ed55a4a854c7a5abbeb2a21c9ba
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK'. The primary malicious URL identified is 'https://seumenha.ru/strik?utm_term=why+does+hopper+go+into+standby', which is likely used for phishing or to redirect to further malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=why+does+hopper+go+into+standby PDF link annotation
    • http://kefojixesopu.66ghz.com/xuzimojosowezudukaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/LicFwyx/nitofegexexisonew.pdfIn PDF document text
    • http://bemelegevew.22web.org/gakubuxojejar.pdfIn PDF document text
    • http://pitepon.22web.org/where_can_i_buy_the_5_love_languages.pdfIn PDF document text
    • https://cdn.sqhk.co/gadowikuxe/VqDjje5/hssc_clerk_official_answer_key_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusotofamagukam.rf.gd/how_to_have_a_good_relationship_with_students.pdfIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_16c8680d453148bfaf423bd9f21bd0df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/29420626130.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/6.5_creedmoor_load_data_h4350_eld_x.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/65921679632.pdfIn PDF document text
    • http://supikovibamukip.epizy.com/deguzanuwebajenopo.pdfIn PDF document text
    • http://zeraginijumeje.epizy.com/38043747102.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/100_startup_review.pdfIn PDF document text
    • http://bigobawavelig.epizy.com/short_story_english_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/pobesixo.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/individual_health_care_plan_template_for_schools.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_5cb971e6e3ec4dfcbfb5239f34f5b8cf.pdf?index=trueIn PDF document text
    • http://mevusajilitum.rf.gd/executive_chef_cover_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/schlage_keyless_lock_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 5444 bytes
SHA-256: 7527905371d02257fd2d9ca1b2cd98401d3e44317f639daa4b29a6ce7376cdb1
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 11384 bytes
SHA-256: 6ef5d1a6510c864d8332051791d11fdce98b32d922d854053df4b0819b33c6ce
font_02_sfnt_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 16664 bytes
SHA-256: f694c761250f2b392e8b40418806b9440f453a5bc284d191e2a99492a61ba144