Malicious PDF — malware analysis report

Static analysis result for SHA-256 890f876debea2376…

MALICIOUS

PDF

78.9 KB Created: 2021-03-23 16:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ec46f253651a9c0675cb00470a3c445a SHA-1: fb237cfa4da6fd186e6bae4a9ebbe0c69421f87f SHA-256: 890f876debea2376101c1fbd3821acc0725930c61400320b4528d1fb81c8936f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate an attempt to redirect users to potentially malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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/wix?keyword=the+power+of+six+pdf+indonesia PDF link annotation
    • https://cdn.sqhk.co/nuxazagugura/rhe5Bic/vexunukex.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/PNT8Thg/fantasy_hockey_tips_for_beginners.pdfIn PDF document text
    • http://wezinesiwej.iblogger.org/gusukusagekolotej.pdfIn PDF document text
    • https://cdn.sqhk.co/bezugisav/eah6lgf/camisado_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/bUhcSRl/tebifipiguxenim.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/ShPvmCW/best_soul_armor_minecraft_dungeons.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/gdvcwJo/voice_activated_jumping_game.pdfIn PDF document text
    • http://fesumebujurasa.22web.org/fill_in_missing_numbers_hundreds_chart.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/jlab_intro_wireless_headphones_review.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/KiiNicB/71674253688.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/5a7h5re/battlehand_guide_dog.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/bhegdgg/video_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/fjcigmX/open_houses_this_weekend_dedham_ma.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/vovan.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/heugdid/juegos_online_bubble_shooter_classic.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/qjjhghd/4_pic_1_word_9_letters_level_3287.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/K0Ksid3/another_term_for_colour_palette.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_41d56b24ae56408e9aa0577ea9e86c42.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_d9b91cf96f2841d388a45fb87dfd5f6f.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_fbd102cd638840b09b8dfa8b7a50f9ec.pdf?index=trueIn PDF document text
    • http://xotekibibira.rf.gd/bavinck_reformed_dogmatics_volume_1.pdfIn PDF document text
    • http://dazulenaredon.rf.gd/mujilagixakij.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/digewitev.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_f20c436f14da4cfea4ddf0059bc645b5.pdf?index=trueIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/administration_department_functions.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 5204 bytes
SHA-256: b85b2fefc4cf2f9b294076c39ffb1a4aad91a42efe15f04d0c483dc78bd956b4
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 11252 bytes
SHA-256: 51dbf94947f2a65e1f760f368d9dfc4a5ee6c0c2ea9d8935f344ccbee9b3da5e