Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c032d4812a88f0…

MALICIOUS

PDF

68.7 KB Created: 2021-03-26 06:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 164d2ad6c550ca0f70bc0446f3e75d57 SHA-1: 21c2eeb8ff94c0bf248c49c622ae9aae4e1546b6 SHA-256: 10c032d4812a88f05cf5ba4bfb36bdb8e0c2f2604834a855fec1016aa8ecef40
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs point to domains associated with potentially malicious content, including a link farm heuristic firing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/award?keyword=days+of+the+week+worksheets+printable+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465949/normal_601f1502a2594.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/c24dc3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6019a6a174ed2.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/tanowixegezutesinux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_603c350d14bb8.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/ig2gdK4/92281551736.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizajo/xh5igPu/cara_menggunakan_multimeter_analog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lososimap/aparichit_full_movie_hd_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda59b7b-316c-4935-ba2a-bfff2c6293f2/73995089856.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/bidesiya_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/89288418225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eed1d60-6f23-4f2e-9da6-565b99e60f0e/77502805550.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/finding_nemo_full_movie_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc4781b-783f-400d-8797-b2e1929ac269/logitech_m325_dpi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252f87aa-ab08-46eb-98b9-ca0f76bded7a/wamixijabakowedewojuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fb66ec-ec56-42c7-9f62-966de42b0e17/delta_table_saw_motor_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5257d69-8ee7-424e-a491-0b9f826cd054/best_essential_oils_for_emotional_release.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/2822098609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765edbfe-10d4-473d-8451-58c84a0a3e2a/how_to_print_usps_labels_on_dymo_450.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_off0000d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD051 5528 bytes
SHA-256: 4456af9183f6160ba131b64027d0bddc486a670de2706f3268272378ed2fc97e
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 10032 bytes
SHA-256: 1f0ebcb5434bc025aa792c526c6509a72f01520fce7342c7b698e64fdb630995

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