Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ac02b70bd8ea13…

MALICIOUS

PDF

93.0 KB Created: 2021-06-13 00:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4215c6c750f20d98ddb8c7807c41c94a SHA-1: 77311046fbbf506025e9e9b2f84e1ccc4efff304 SHA-256: 52ac02b70bd8ea13663fb98a68af89b8704839ea1e10f3a6fcf1df6b51eb9b01
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://archism.ru/pbw?utm_term=garageband+guitar+lessons+ipad PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4405904/normal_60b61b4aaa7ac.pdfIn PDF document text
    • https://xavebebojemap.weebly.com/uploads/1/3/4/8/134848852/tatirusewelikab.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/5839068.pdfIn PDF document text
    • https://tigekinoninufuv.weebly.com/uploads/1/3/4/6/134687643/tinuf.pdfIn PDF document text
    • https://xalofaba.weebly.com/uploads/1/3/5/3/135339869/b8f5a4c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4372696/normal_60b19051a6f4c.pdfIn PDF document text
    • https://vefupidukubimaz.weebly.com/uploads/1/3/4/5/134597042/rujabedokazokugamove.pdfIn PDF document text
    • https://tinuvireredat.weebly.com/uploads/1/3/4/8/134864568/kudod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_6056b0340eff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_6051c043dfe20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_6064397f9e25f.pdfIn PDF document text
    • https://deroguba.weebly.com/uploads/1/3/4/6/134684347/9d8b2.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/e00fbe38-58ba-48be-8683-73943004efbb/1122497573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131deb51-9060-44a0-92cb-59d5f3c0db0e/exponent_rules_worksheet_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8df9a6-92a9-4cc2-8c0c-2f0e9d3d609b/verbs_exercises_for_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae906cf9-bc34-4b42-9ce1-fb6450d8d549/49626993238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736c8ac4-5d4b-461c-b0ae-01bcc915d526/ford_fiesta_radio_code_4500_rds_eon_locked_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6d67cc-49b6-48b9-8692-99a79d9e0dec/how_do_police_conduct_an_investigation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af12575e-669e-4214-89de-83f5e484ed98/how_to_program_a_woods_light_timer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5f8cbe-c9cd-4659-9852-363566ee0186/bose_quietcomfort_15_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bf84c5-8dd8-421f-a74e-9fcd3bc79409/92518481520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1274e5-29b5-49c0-8d53-7d1f56b8b2e6/zimilukuwatikiraji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c513ea4c-dd35-48ce-b9ff-6a44b4a63617/air_force_1_pixel_with_chain.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_off00012dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAC 5300 bytes
SHA-256: 665ef9df26cf7b7557f3de872212d1a9d9ee92185e10014f6b5b165e1a6cd1d9
font_01_sfnt_off00013fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB8 11324 bytes
SHA-256: 08727a1eb8797082129a8aae25afba64e909c6bb6f76c0b75d951218444d012a

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