Malicious PDF — malware analysis report

Static analysis result for SHA-256 172a23576c036dd5…

MALICIOUS

PDF

73.6 KB Created: 2021-03-28 06:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c4608dc03a334bdf69c7f1bcdc4856f SHA-1: 73df5edf2715d10fab1e2238f2584c35816de553 SHA-256: 172a23576c036dd538eb6988160259810dd9108f602742639f7c9f95233635de
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many of which are suspicious and likely part of a link farm designed to distribute malware or facilitate phishing. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=compound+sentences+worksheet+for+grade+2
    • http://avtoshkola-region26.ru/how_to_trade_with_vwaplj2xk.pdf
    • http://fuxanujibiz.mygamesonline.org/sgfi_tug_of_war_rules.pdf
    • https://cdn.sqhk.co/fenozidu/gjijsgi/bts_fake_call_with_love_lyrics_english.pdf
    • https://cdn.sqhk.co/sozaxejiv/chgibXw/dead_cells_all_runes_guide.pdf
    • https://cdn.sqhk.co/nowovadizeb/heha6bk/juventus_logo_wallpaper_cave.pdf
    • http://zarudofafibitov.mywebcommunity.org/kumon_math_workbooks_free_download.pdf
    • http://sallehub.xyz/polaroid_one_600_classic_kamera_filmh3ndb.pdf
    • http://helpcopyright-service.com/jalikadiruvesabivuruwjtn8c.pdf
    • http://wspring.space/22016291325aaf1m.pdf
    • http://ledy66.net/zemomowirufenurexufovoyo039.pdf
    • http://kidiwutimako.mygamesonline.org/gusigagakapiwe.pdf
    • https://cdn.sqhk.co/mifigatira/bidWhh2/nuzeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_2a27ee7daf7c4cbd9cea4101756976c5.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_161919979e16439a9b0431214dadfb70.pdf?index=true
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_ca351d2a476d4d459df49dff2a868ff4.pdf?index=true
    • https://s3.amazonaws.com/kujapomib/52021323406.pdf
    • http://nosigegu.onlinewebshop.net/tazarewarirefotemado.pdf
    • http://vimixof.onlinewebshop.net/how_to_install_xfinity_cable_box_to_tv.pdf
    • https://s3.amazonaws.com/gulapore/86465753438.pdf
    • https://s3.amazonaws.com/jeromisixinolib/captain_underpants_book_set_costco.pdf
    • https://s3.amazonaws.com/dadupawo/bike_games_free_my_play_city.pdf
    • https://s3.amazonaws.com/kufazete/kozewedefuxaver.pdf
    • https://s3.amazonaws.com/zoromexemuzid/basomak.pdf
    • https://s3.amazonaws.com/bupesejirijejus/free_visio_organization_chart_template.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_off0000e1e8.bin
a7d5f829ae370b64961b15320d8af44af5cf258881338681da3679408f19a2cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 5732 bytes
font_01_sfnt_off0000f550.bin
789df30246c44b50b7b74dd7310de8746f8af6b18d17d2486327707c6810c3b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10328 bytes

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