Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41017dbd3f98d37…

MALICIOUS

PDF

87.8 KB Created: 2021-03-04 01:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 77787a4d664f63d2a0898ba98891d29b SHA-1: 98ce205d02d216e4e8b07ac4c74c989990c1b455 SHA-256: d41017dbd3f98d3752d9c0365d2f39feb2b2a2ee10bbe4cd856dbf79e27d0769
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. One prominent URL, 'https://zajinet.ru/123?utm_term=what+is+the+difference+between+journalism+and+mass+communication', is presented as a search result, likely a lure to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=what+is+the+difference+between+journalism+and+mass+communication PDF link annotation
    • https://cdn.sqhk.co/biwopeka/VicehtN/the_forgotten_dungeon_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/jdie4qL/why_is_my_android_internet_running_slow.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/how_to_make_creamy_lemon_garlic_sauce.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/livukiluxuvojegal.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/8942258.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/sakixo.pdfIn PDF document text
    • http://pobalulegofi.22web.org/how_did_the_2nd_great_awakening_change_american_society.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/14649138925.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/xaguxonopubedipuxefijat.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/32744217352.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/d8083fbf6.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/jgjf0wm/change_caller_id_to_private_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/9yVZagc/pixel_gun_first_battle_pass.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/84986152211.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/zomuzigo/63846698456.pdfIn PDF document text
    • http://papumubi.epizy.com/22201447768.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/afunika_new_video.pdfIn PDF document text
    • http://patepupitisozaw.epizy.com/21014158841.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/fe_review_manual_free.pdfIn PDF document text
    • http://bedozev.rf.gd/beggars_and_hangers_on_tab.pdfIn PDF document text
    • http://zugumez.rf.gd/economics_a_level_past_papers_gce_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 5584 bytes
SHA-256: 1af5b512ad3d8201334d78ec42e2c49bd262f6d635a8fc427a8c03cb044316e3
font_01_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 10256 bytes
SHA-256: d95ac0369a36197f180dfa3b91b45e07143a86ab05f017dd7d64790ae3b79726

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