Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c7e9f8c4a0ef17…

MALICIOUS

PDF

80.2 KB Created: 2021-04-20 22:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ab1ba985a49513c21c2f5517cd107254 SHA-1: 9c22c44cc834f680d9dff4f2c9cb396ef5400b1a SHA-256: 31c7e9f8c4a0ef177a501c3dc0f1a035fd5f097127350190756abad95be1e90a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to 'Logitech k800 battery status' to trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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://jumiwimov.ru/strik?utm_term=logitech+k800+battery+status PDF link annotation
    • http://idealslimitaly-ufficiale.site/does_sup_game_box_have_pokemonk0w4h.pdfIn PDF document text
    • http://pushbiz.fun/wivupojififekh495y.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/bCEZHme/soxesozokudasumojori.pdfIn PDF document text
    • http://helper-badges.com/605022864066umpy.pdfIn PDF document text
    • http://womenit.space/bubble_gum_simulator_script_gui_20203w1ck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601a013e1929a.pdfIn PDF document text
    • http://graatorama.fun/2001_club_car_ds_parts_manualbus0j.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/ghost_of_spirit_bear_book_summary357py.pdfIn PDF document text
    • http://mif-smeh.space/davukelijakitw09n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476275/normal_5feb3ca745e68.pdfIn PDF document text
    • https://cdn.sqhk.co/dimusokobab/hiAheeX/46513830584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_60115ab767e7f.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/Shjhh5e/80767079294.pdfIn PDF document text
    • http://vezerfa.xyz/witebokasuvidexedadekezikq0git.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_60007cb29a9bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477156/normal_5feea9153c124.pdfIn PDF document text
    • http://reduslim-officialsite.site/92707133914ftaz9.pdfIn PDF document text
    • http://firstflirts.site/81088289102x38og.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/gdqifhf/migonurov.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://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_a8c50d0a556642848805b7f7e10f60a2.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_65eeeab34bbe4eb6a44c434414a01c4a.pdf?index=trueIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_d6caed905fea4123addfeaea27bd2d45.pdf?index=trueIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_04ab87889aec48bcaf214fc2863584ad.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_023e01c32ce24affa70ab451aa36a0e4.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_78d803769ac04feaa6d82ea3a2943af5.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_38fdebd047dd49239f43d7e6b18497d9.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_c30319c3fc8e44758c00fa446832db43.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 5388 bytes
SHA-256: d0c78b30dcd219862a7e0eb062233f2bba3594b2b312de4330617e442332e788
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 11112 bytes
SHA-256: 8a60371f4b666929499fca921fdd8b6849a83833ea44bec89534915710727b24
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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