Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de871ff39a7ee93…

MALICIOUS

PDF

82.8 KB Created: 2021-03-25 03:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ad27b65ce5e925516b3b7b24488fef8f SHA-1: 90caf4e4816d316044fc7b99e5a886c746fd9262 SHA-256: 4de871ff39a7ee93b2262d7b1e299c3193a619713927beb3b18884934fcdbf61
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting services and link farms, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=sixers+theme+song+sheet+music PDF link annotation
    • https://cdn.sqhk.co/tavikagisato/45hjjbL/32863429295.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/gjns1hf/city_driving_3d_zuuks_games_download.pdfIn PDF document text
    • https://gamaditer.weebly.com/uploads/1/3/4/5/134583337/gekowexajodid.pdfIn PDF document text
    • http://vovpomnim.ru/chatrapathi_tamil_movie_video_songs_freepivkm.pdfIn PDF document text
    • https://databuzub.weebly.com/uploads/1/3/4/3/134373368/6634458.pdfIn PDF document text
    • http://lady-bug.club/furemewo27a.pdfIn PDF document text
    • http://inscarusa.info/how_to_cook_beef_ribs_in_offset_smokerridk9.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdfIn PDF document text
    • http://coloradocustomelectric.com/916094519y5tlp.pdfIn PDF document text
    • https://dixatobuvug.weebly.com/uploads/1/3/5/3/135321084/kopomusumo_jevopufafofe_jopavewexowufaw.pdfIn PDF document text
    • http://arm-watch3.club/zelda_breath_of_the_wild_rom_downloaj73xg.pdfIn PDF document text
    • http://razvivatel.blog/cap_study_guide3ttc2.pdfIn PDF document text
    • http://disconto50.info/pigutejigobufesewonclc.pdfIn PDF document text
    • https://xetinize.weebly.com/uploads/1/3/2/6/132695894/fuselifupojug_dajabosi_vopunedab_kovekijegoriw.pdfIn PDF document text
    • http://huaweistoreukr.xyz/what_if_cleverbotamvj8.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/J1hhiaS/52238096937.pdfIn PDF document text
    • https://wefakibulebu.weebly.com/uploads/1/3/1/4/131408371/dekasewowa_gosenifupam.pdfIn PDF document text
    • https://cdn.sqhk.co/rutuliduzo/c3ViabC/57131661636.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/letefufikitin.pdfIn PDF document text
    • http://tixshopclub.space/524348068923xyyv.pdfIn PDF document text
    • http://comp-arenda.site/mipejaposigigorogakiut8hv.pdfIn PDF document text
    • http://chaptejvxz.fun/38565063390mnk34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jugututinotu.rf.gd/persona_3_chihiro_social_link_guide.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/onesignal_android_example_github.pdfIn PDF document text
    • http://nivugugop.rf.gd/75160352717.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_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 5140 bytes
SHA-256: 9bae7d835916cb6e8672b1257a774688a5e105130cfa0b1ae8490faa8ced1900
font_01_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 10820 bytes
SHA-256: e215f2511c406bc43df79857e35b3f72d0ee2943d3d45a8b02b399ec67e86055
font_02_sfnt_off000126f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 16076 bytes
SHA-256: 77d0e41b193f2956426f125f137c5665e22c2099967b8d3a504bff5b234847bc