Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18cb0086b0d986f…

MALICIOUS

PDF

76.0 KB Created: 2021-06-06 07:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 340696c8b6721cb66d35af5e2a97804d SHA-1: d62f9e098c720e7cc696bb4a5128685f5d335418 SHA-256: a18cb0086b0d986f591f602e8a72d1775612673ca2ae5e7e4b3db044a097cf24
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It uses a deceptive lure related to software tutorials to encourage downloads from external sites. The presence of numerous external URIs, including one pointing to a link farm on disposable hosting, suggests an effort to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://allytemp.ru/pbw?utm_term=autodesk+revit+mep+tutorials+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4376088/normal_605992bfaa0cb.pdf
    • https://cdn-cms.f-static.net/uploads/4450353/normal_5fd28dffb0ddd.pdf
    • https://cdn-cms.f-static.net/uploads/4420222/normal_604190d1889dc.pdf
    • https://josubolifixit.weebly.com/uploads/1/3/5/4/135400154/viburunalosapoga.pdf
    • https://cdn-cms.f-static.net/uploads/4469626/normal_60402e4dd14c5.pdf
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/8803915.pdf
    • https://zelejipez.weebly.com/uploads/1/3/4/3/134353750/aea3e6b3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gazoridixilu.pbworks.com/f/silonozuvotodan.pdf
    • http://wamotarirup.pbworks.com/f/tatikaxenuzituj.pdf
    • https://uploads.strikinglycdn.com/files/671c8d72-c14d-4e2d-9134-39572f20ad83/77262339337.pdf
    • http://wuxikadafi.pbworks.com/f/88819870761.pdf
    • http://niwomif.pbworks.com/w/file/fetch/144427620/27569529647.pdf
    • http://lajaweridadi.pbworks.com/f/does_norman_die_in_the_promised_neverland_show.pdf
    • https://uploads.strikinglycdn.com/files/a1fbdc17-639b-4bda-a98d-eeccf382f2db/halo_novels_with_master_chief.pdf
    • http://gudotoxej.pbworks.com/f/how_do_i_reset_my_slim_folio_keyboard.pdf
    • http://xifatarege.pbworks.com/f/how_hard_is_it_to_get_a_5_on_ap_calc_bc.pdf
    • http://xafusigivu.pbworks.com/f/kanmani_anbodu_kadhalan_new_version_mp3_song_free_download.pdf
    • http://larabefejaji.pbworks.com/f/4704250079.pdf
    • http://najapenoz.pbworks.com/f/pachelbel_canon_in_d_piano_sheet_music_original.pdf
    • https://uploads.strikinglycdn.com/files/da369d7f-3f0d-4751-83c3-ff66b1e075ad/vewetogusekadilifowobop.pdf
    • https://uploads.strikinglycdn.com/files/35dc89ba-3233-4b41-9b23-d5ccbc649b3f/mojekepedetavijipegi.pdf
    • http://kiwazotomija.pbworks.com/w/file/fetch/144647622/31376028656.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddad.bin
aaefcc83b32445e1a7c1df04ed171d3559caea0c020efb7a659008d6a2f0b846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 5276 bytes
font_01_sfnt_off0000ef90.bin
8ea6a1524f0f019f29bd7a76ae0788c0c0c807a7a93ece6acf3e9fca79b467dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 10624 bytes
font_02_sfnt_off000113a8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 4324 bytes

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