Malicious PDF — malware analysis report

Static analysis result for SHA-256 261fd1fa56b18745…

MALICIOUS

PDF

140.6 KB Created: 2021-03-31 12:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1249269ff3298c2c59e833c1a733c477 SHA-1: 84adfa6cbe4d6c6b4fb0ca013e9fc58c07d64596 SHA-256: 261fd1fa56b18745c2089ce7a450bf8e3a48c8490d656449c815db919c744762
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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/award?keyword=photosynthesis+journal+articles+pdf PDF link annotation
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/tajobo_sinomizazajebov.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/suxiworon_lobegibatukokox.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/3716036.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/jdii6gj/51709397403.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/ibhgrhU/music_player_bass_booster_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/heuC9hY/vixal.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/zge0jhP/zombie_age_2_hack_apk_1._2._7.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/uhfmMT0/movistar_play_argentina_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/iichhlC/jekowomogomabesudajobakaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/hbVjfib/duplicity_harry_styles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_600cfa38adc71.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/hiiyMuV/zombie_riot_csgo.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/hLhgiau/paplinko_free_pachinko_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_6013611f9ef5f.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/ciauyib/titan_quest_atlantis_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_600387eed8310.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixapudel/bijxhhu/promissory_note_template_wisconsin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/what_are_personification_examples_for_dogs.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/list_of_basic_words_in_french.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9A3 5420 bytes
SHA-256: 1fa91e708ac7731a9370916bac7fc11a53f096ae03ac49ee5d308e4a76e4fe1f
font_01_sfnt_off0001fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC1A 12588 bytes
SHA-256: b66db5e01308383061837e5de5334d0dc1fce09fdc43d4061614149d921133bb

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