Malicious PDF — malware analysis report

Static analysis result for SHA-256 177c90a1cc958ddf…

MALICIOUS

PDF

80.3 KB Created: 2021-02-18 13:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 67eb7a15c8c4387a6b465be70241df1a SHA-1: 525ba764fc6cad97d06b01a58642fb11ead955e6 SHA-256: 177c90a1cc958ddfea481f8b671f8b404335a95b05a18c8dc7216dc515e9c9de
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable hosting, many of which are SEO-optimized with keywords like 'michael kohlhaas summary'. Heuristics indicate this is a link farm designed to trick users into downloading further malicious content, as confirmed by ClamAV and ML detection. The primary attack vector is likely spearphishing attachment leading to a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=michael+kohlhaas+summary PDF link annotation
    • http://natiral.space/81233829374rksw7.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/hjgdqL2/sedetel.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/d6dijen/sukipaxesukef.pdfIn PDF document text
    • http://moneymaya.site/sotodunovise6qvmc.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/sgf6gcF/download_toca_boca_lab_elements_apk_mod.pdfIn PDF document text
    • http://proflist-briansk.ru/lowes_samsung_refrigerator_counter_depthhgak4.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/1HlKxih/mini_zombie_takis.pdfIn PDF document text
    • http://omynutural.space/how_to_tell_you_have_a_bad_o2_sensorb92pa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_60079ecc3aae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5feb4c1cd9083.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/lLbigii/kozani.pdfIn PDF document text
    • http://magnetfix.store/que_es_un_estudio_de_caso_en_enfermeriaw0nq7.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/My3Rgiu/vemopozanej.pdfIn PDF document text
    • http://geleostone.online/volume_of_pyramids_and_cones_worksheet_kutaqhzay.pdfIn PDF document text
    • http://100naturals.fun/what_is_meant_by_pearl_of_great_pricevjlgu.pdfIn PDF document text
    • http://cloudmarket.website/zatitabonojuradixekeliay6p9.pdfIn PDF document text
    • http://spainsale.pro/sketch_the_mitotic_stages_worksheet_answersmra1c.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/hQ4hgha/beach_buggy_racing_2_cheat_mod_apk.pdfIn PDF document text
    • http://speak4pro.com/windows_10_offline_isoa5l1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366043/normal_60047b8b34a10.pdfIn PDF document text
    • http://ital-girl.space/fm_approval_guide_20184h65d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 5208 bytes
SHA-256: 6c266eaa62a8949123059d407424665aa62ae4dc6d3bee5588e700f086788aad
font_01_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 10812 bytes
SHA-256: d28cf88bc3a5834524105f2ba345c42adeade107301a3d258c088fc4ad8ab231

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