Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6855d334c39fcd…

MALICIOUS

PDF

89.8 KB Created: 2021-05-26 08:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 94d3759f69a78e78c74fcd2da640fdbd SHA-1: 26d3e1983adf2618a170a5ebdc75d93a74d6876f SHA-256: 5d6855d334c39fcd4e8e9d7c07bec82f456ee367dcd6a0d9faa39316ef11fb87
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://jacksth.ru/strik?utm_term=divina+commedia+canto+6+inferno+analisi', suggests a lure related to literary analysis. The presence of ML and ClamAV detections, along with the PDF_SEO_LINK_FARM heuristic, indicates a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/strik?utm_term=divina+commedia+canto+6+inferno+analisi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5ffd36d585294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_600c8649e5f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_602542764b80c.pdfIn PDF document text
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/3a5a88c0.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/5519220.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/3914772.pdfIn 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/2db97fec-5980-4739-8d19-d74c7a30e5a3/microsoft_visual_c_2015_redistributable_package_x64_download_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84925599-8237-492a-8a73-1c216ceaf9ab/96216502000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c354dbd8-d967-4927-b8fe-a9e2a077cf5d/52964958591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974a7017-75ae-4457-8e83-4eac0b70774a/kuvuviloganipaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2a930b-33a7-4f53-b52e-87c95019b124/vujeb.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/alcoholics_anonymous_big_book_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40b16fd-9af2-4fec-b73b-e3346e1e8098/what_animal_produces_the_most_offspring.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/dovewuxigobus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0795af7e-062c-4a5c-a7ea-3487dfe12e93/35402367792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9e2247-1410-4064-9619-80dba2128d7b/32721676004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f41a821-8717-47a8-8ac0-3f45e64d80e0/snow_white_evil_queen_toddler_costume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2cd60fa-62d7-4bed-ad55-4e7f0da999fa/is_vegan_ok_for_daniel_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3252cad1-d21c-4fee-a80b-33fd485ee8c1/your_name_engraved_herein_full_movie_eng_sub_online_free.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_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 5380 bytes
SHA-256: 1ddab11a08b3998494ec2edef756475b04724e4a1636b32734ef39f392f9654a
font_01_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 20432 bytes
SHA-256: 62e6c4c1a1820ccce6e052d4990dd0ee21807b49c90ff3ef69f767152093d84d

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