Malicious PDF — malware analysis report

Static analysis result for SHA-256 c255c6700717026e…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 10:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64fc0c66c0b4dd71d24f1e59a2624e35 SHA-1: 51b438b54cd2afab8aefb8955d69f0a5f9f59a15 SHA-256: c255c6700717026e4979e9520cf0bf7cf7b202dff1eae2c650bdc999ba7aba76
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=family+traditions+worksheet+pdf
    • https://cdn.sqhk.co/bovokolel/cihifjb/hd_video_player_windows_xp.pdf
    • https://static.s123-cdn-static.com/uploads/4444113/normal_5ffd41e5bd18c.pdf
    • http://pejofewetoz.22web.org/1874637194.pdf
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/6893802.pdf
    • https://cdn.sqhk.co/gabisolovima/ggiidX0/skateboard_party_3_pro_apk_download.pdf
    • https://static.s123-cdn-static.com/uploads/4461505/normal_5ff328d268599.pdf
    • https://cdn.sqhk.co/ragojagef/fsChhH5/columbus_zoo_virtual_tour_2020.pdf
    • https://cdn.sqhk.co/fukonovum/gi2iijj/39867996800.pdf
    • https://cdn-cms.f-static.net/uploads/4419452/normal_5fd9ae1f483cb.pdf
    • http://savupubib.22web.org/83156039721.pdf
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/sotulenonoxidamiz.pdf
    • https://cdn.sqhk.co/lituxopevuk/rrjeRjy/cut_the_rope_magic_gamepix.pdf
    • https://cdn.sqhk.co/kufagilan/iC11Shc/talking_wolf_productions.pdf
    • https://cdn.sqhk.co/munuluxel/ijc6Ehe/pejufomen.pdf
    • https://cdn-cms.f-static.net/uploads/4423471/normal_601ef30a67317.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nimesirasono.rf.gd/tea_party_invites_templates_free.pdf
    • https://s3.amazonaws.com/mesotodimus/calendar_table_excel.pdf
    • http://zuvemodu.rf.gd/test_english_file_beginner.pdf
    • http://gogolozumer.epizy.com/windows_10_for_virtual_machine.pdf
    • https://s3.amazonaws.com/vososasoxumete/ayyappan_video_songs_malayalam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df12.bin
37d7d3d6cdcc9c0296868dcc41d594ec3f7dca444c7bcff7c3f0ae2cbf8e6f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 5496 bytes
font_01_sfnt_off0000f1b5.bin
d3c67fe6936866b3a88f17f8596bda5aaa30822bc64d5612593f27866f0bdd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 10240 bytes

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