Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fee3c39e1c2808…

MALICIOUS

PDF

83.8 KB Created: 2021-03-15 02:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5f4597527eb7cb12d192fe192a6e3b98 SHA-1: b09c2336d209a7caa241f0711c8a817011700bd2 SHA-256: 82fee3c39e1c280806aa3d6f23afacb0e8c9f04165f5a24608c257a991a5f2ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains a reference to 'omnibus budget reconciliation act of 1987', which is likely a keyword to attract unsuspecting users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://leonvi.ru/strik?utm_term=what+is+omnibus+budget+reconciliation+act+of+1987 PDF link annotation
    • http://raffle.website/65089657196dv6pp.pdfIn PDF document text
    • http://karaulovlife.site/58741163524qqyje.pdfIn PDF document text
    • http://cmb-societe.com/total_studio_2_max_review5o5gh.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/what_is_the_difference_between_single_phase_and_three_phase_connection.pdfIn PDF document text
    • http://swiss-gear.store/pokemon_fire_red_battle_musicava7s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469634/normal_603defaad29fe.pdfIn PDF document text
    • http://canonsburglake.org/59959390358xesyq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fca2c6671bc5.pdfIn PDF document text
    • http://ca-manalapan.space/327876858611ur40.pdfIn PDF document text
    • http://fitness-ital.fun/android_open_source_video_editor_github0y0hb.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/sub_zero_650_manual.pdfIn PDF document text
    • http://fruits-summer.fun/zabaranenobivemobefudiy71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410953/normal_60025d9ed0972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_600c02c76dcf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_60344c8b58d13.pdfIn PDF document text
    • http://cenderaoriginator.com/99857808951ngfiq.pdfIn PDF document text
    • http://cetop.xyz/7068558749642jss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riveminigokoxa.myartsonline.com/dyson_dc39_repair_manual.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/expository_bible_study_outlines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4535b1a-233b-4bc7-abe1-d707be7e83c5/59523216058.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/kowa_ap_7000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0ea5f1-772c-41e7-875f-5fb5db67f559/how_to_prepare_for_pl_sql_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60454bfb-5320-4f2b-b37c-b38d06857dcd/vajobodebu.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_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 6068 bytes
SHA-256: 1eb50883ac6e7dc13b1842576f611b018ed69a7169a84901f5f0b16d6f09f371
font_01_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 10584 bytes
SHA-256: 612597f33860289fde9c50f264c98301590cd51f6c66ff62f35151a4079362b8