Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f66f1ae9f56663c…

MALICIOUS

PDF

78.6 KB Created: 2021-04-23 23:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 857466ff4649e8f6f06f8ba816ed5822 SHA-1: cec233eff894221911d570a89d967fceb1ed4508 SHA-256: 1f66f1ae9f56663cd27728fa40f65d86e40cc854f72cf4a6e5ef5d9de9915280
196 Risk Score

Malware Insights

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

The PDF contains a mass external link farm and an SEO redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious lure designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=how+to+be+in+shape+for+soccer PDF link annotation
    • http://sewowenokep.iblogger.org/79581858693.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/jiluwojodamevegumejotoput.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/wisesinonevogopudijuraf.pdfIn PDF document text
    • http://verezitabel.66ghz.com/voneripusofuvosejonu.pdfIn PDF document text
    • http://kuvuradivikosef.iblogger.org/work_instruction_template_in_word.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_248d0857fec04c7f8ff4ac86586d1fc6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4602a54c-6993-468e-9797-5e46cb51800c/what_does_having_no_service_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/angina_de_ludwig_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/zewonoxozebowux.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_4b2393c865964a0a822b4626e4fc9855.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af4d740-3856-4a24-bff1-8a2f4d08b2dd/amusement_park_trivia_questions.pdfIn PDF document text
    • http://gekepogeje.rf.gd/wevuzasajoxozer.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/lady_of_the_lake_witcher_3_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f8695d-453e-4963-87da-47ffaad4aa44/family_feud_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/73110862821.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/pasubiluba.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/safe_drive_save_life_programme_report.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_06e6c05563a94d70aa31fa7ae1594be0.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_af03fa2e62824c23a4b1ad2c610d79ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/niwejag.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/sonoxewetit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27e231d-a9e6-4349-b3ae-a27d59ac4f2e/revumogixekivudikolen.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/attack_on_titan_characters_season_4.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_3c046844ab2142c4a467bf6956fab854.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/analisis_del_diagrama_bimanual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe26dbb-00fb-4e6d-b67f-ba1c4675574b/how_to_play_cyberpunk_2077_on_pc_with_controller.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_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 5052 bytes
SHA-256: 4dcca7e6175270f59c83c5924912c742f6f7bb34114ada4e2fe4bb9878fb4e1c
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 10448 bytes
SHA-256: e31e3a18eb541379427282f56844b337a88599b856c3cc7f3746ce42ea76a2a9
font_02_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361