Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ff924d44cc1e24…

MALICIOUS

PDF

71.6 KB Created: 2021-01-28 11:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1d6bf5fa00c5d02edceeffa419077f4b SHA-1: 8508aeca8ad8b4e31bc954c2148c98278a675c96 SHA-256: 42ff924d44cc1e249893d454de8851eea7b64692936238ec1d483ea8c150222f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://druttle.ru/123?utm_term=sales+executive+employment+contract+template PDF link annotation
    • http://zhigina.ru/video_maker_with_music_app_free_download8jh4x.pdfIn PDF document text
    • http://agentsoft.space/adjectives_exercises_with_answersk82lk.pdfIn PDF document text
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/78be5f4a.pdfIn PDF document text
    • http://zoompol.xyz/merge_tower_botsla009.pdfIn PDF document text
    • http://sberpodarok2020.online/best_tiktok_video_appc1dn5.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/1425288.pdfIn PDF document text
    • https://rexirarilabe.weebly.com/uploads/1/3/2/6/132681411/7efe0db.pdfIn PDF document text
    • http://cuzinfo.ru/zulrah_phase_guide35fni.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/2465762.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/jejemesasemode.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/1812f.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/mejiminepolokise.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/tafezuzefij.pdfIn PDF document text
    • http://mebel-albero.ru/english_song_download_mp3_ringtonezhxr0.pdfIn PDF document text
    • https://zesoxomilojul.weebly.com/uploads/1/3/4/0/134018604/790645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_600c7dbcf223a.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/wotusilorifijo_tefuku.pdfIn PDF document text
    • http://losmopaka.site/17022835066nqv87.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/4804998.pdfIn PDF document text
    • http://gallery-shop.site/tumblr_black_aesthetic_iphone_wallpaperwldur.pdfIn PDF document text
    • http://ndfnasg.xyz/the_boondocks_season_1_torrent4e60d.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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 5412 bytes
SHA-256: 29a2d53b98cf9f12d9694de323c028b8992d639792b4342cc42421c8de832979
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10496 bytes
SHA-256: 5d15d6e3a9de115874c124dd8345f3290377037f726c75413f85aa5bb0fdae7d