Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f55b1c85662f467…

MALICIOUS

PDF

96.1 KB Created: 2021-03-19 17:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9af85a973355d9c61c53f1a23b9bcb4e SHA-1: faac94220f7fb0d36142790782fbabcf27d3ee29 SHA-256: 9f55b1c85662f4677ad858ab303667200088b6518a240e8848672f59c24aec2f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, `https://bologen.ru/award?keyword=anaphylactic+shock+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf`, is particularly suspicious. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://bologen.ru/award?keyword=anaphylactic+shock+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf PDF link annotation
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/637807.pdfIn PDF document text
    • http://setifol.66ghz.com/i_am_alone_images_hd.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/4647266.pdfIn PDF document text
    • http://xarijigok.22web.org/blockman_multiplayer_vip_apk.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/76915642-0614-45d5-a3b9-1185964ef059/book_called_the_diabetes_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e50b1011-4030-4dc1-a42e-61fc9495384f/hp_officejet_pro_8620_printhead_error_code_0xc19a0003.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/59730649487.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/67796943051.pdfIn PDF document text
    • http://puwowiwu.epizy.com/murebafakivet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3627727f-68ba-4872-ba5d-f6a3c2f53a8d/reragivepufonalakawezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb3d508-ba8a-4c0d-a0fd-cfa546ad3701/72516099511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c70182-02ef-416f-b402-89ad34f39d76/will_there_be_a_dr_sleep_sequel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bff03b7-1748-417b-bfa7-12b402f11a99/does_usps_have_tracking_to_japan.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/chapter_13_basics_of_electricity_milady_answers.pdfIn PDF document text
    • http://rozabakesolunu.rf.gd/what_is_to_mourn.pdfIn PDF document text
    • http://joxuritodapeni.epizy.com/78736738877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8fac315-79ff-441b-9665-2ebabb911352/white_rodgers_1f80-261_manual.pdfIn PDF document text
    • http://tejasufezo.rf.gd/funitadusenamepafuve.pdfIn PDF document text
    • http://sepimenixinu.epizy.com/hp_p3015_fuser_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/htc_m8_display_price_in_india.pdfIn PDF document text
    • http://garurake.rf.gd/what_instrument_can_be_used_to_measure_atmospheric_pressure.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011a47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A47 17576 bytes
SHA-256: c2949927ba1f14ba0b402c649932d3dd64f4b1fc79dd0cf77882ee4d0dc328aa
font_00_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 5304 bytes
SHA-256: a0aec69a4fef488f86ac5e9cfa0a78be63cb7fe7ad42b390332507fef9b45f27
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 6180 bytes
SHA-256: 699a409af5455e9679ce95e5180ff5ca84b0167ce04e228ec7106e0465378370
font_03_sfnt_off000149ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EE 10824 bytes
SHA-256: 24b4012aceb5bdfd7f0ad7e439cde8e1db8792d8b09328c5651aea63bbc85928