Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a9b87936e7b258…

MALICIOUS

PDF

103.9 KB Created: 2021-03-22 12:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85b800474337ffa222fcfc963a1d45c2 SHA-1: 76f19c514c4ff1e1700bafc540d26cb39f55c4f7 SHA-256: 59a9b87936e7b2581ded0494f9f8b002872979abec0175a17df38acda41b6f33
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one prominent URL leading to a suspicious domain that is likely used for phishing or malware distribution. The heuristic firings indicate this PDF is part of a link farm and is flagged by ML classifiers as malicious, with ClamAV detecting it as a phishing trojan. The document body, though truncated and obfuscated, suggests a lure related to a product, likely to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/strik?utm_term=tv+ears+digital+wireless+headset+system PDF link annotation
    • http://fiziwafofekaku.mygamesonline.org/elias_oraba_letra_pentecostal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6013a39ac2537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5fce7c261fea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_601678c201824.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/sbi_exam_calendar_2020_20_download.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/diccionario_acadmico_de_americanismos.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/29089739530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_603c71261c978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_5fd8105ddf0d5.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/vicks_cool_mist_humidifier_filter.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/tiralexuradezupegafura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_942d151ff2d84a039f02e3a3808f8c68.pdf?index=trueIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_7caffcccd4f246a1a77a5b7cdc7dffc7.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_00fb7c3628674b2684309e4c6403c79e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff401c3-da2c-48d4-8246-be19f743a80b/when_was_oracle_19c_released.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/learn_carnatic_music_in_tamil.pdfIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_3f7272055e59406bac42a7a29ab72c80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e68c8f4-a9ba-454c-a83c-4f87a91750fb/o_come_to_the_altar_piano_chords_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b716c21-a7ef-4764-b7cd-2aaa1a8feef2/cita_los_pasos_del_proceso_de_la_investigacin_social.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938b94d8-0bd1-4ea0-8773-577a2a0acb5a/guitar_songs_free.pdfIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/centroidal_voronoi_tessellations_applications_and_algorithms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2366fed-10b5-4ec0-b485-e52b9c22828c/putawatogonerazitexu.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_609ec8632cfe4d92b58f74d2ca31f4f2.pdf?index=trueIn 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_off000154d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D1 5440 bytes
SHA-256: 80b4e6a39d5548f440a11f375d0a9321297158867e9a8dfe711c3c1d0ee3e542
font_01_sfnt_off00016740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16740 12580 bytes
SHA-256: 55883e600a250c5928f596e9f78130903cbae89dfe678aed699ea7c31d9b5c09

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