Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99822a57c811819…

MALICIOUS

PDF

71.2 KB Created: 2021-06-01 09:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0a7f4447e3d7a6ca9256a554c3c27533 SHA-1: 4fab4be775c726c96af8baca26d1c235517fb8ce SHA-256: a99822a57c81181931f20708b0590b7adea445c47055b8b1ff23283f11f97ed0
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wastran.ru/pbw?utm_term=why+is+my+range+rover+not+starting PDF link annotation
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/pejogufaz_tevibunanot_sorekirumeku_fovulimax.pdfIn PDF document text
    • https://dotubebiwujodej.weebly.com/uploads/1/3/4/7/134701593/gugonisu.pdfIn PDF document text
    • https://lumurali.weebly.com/uploads/1/3/4/6/134640239/e9c431f25e.pdfIn PDF document text
    • https://nekurunezofadi.weebly.com/uploads/1/3/4/8/134892804/53ce97.pdfIn PDF document text
    • https://tunegize.weebly.com/uploads/1/3/4/5/134500295/raxizorabutevi-dezupazagugiruj-finukovipakojow.pdfIn PDF document text
    • https://tolafapod.weebly.com/uploads/1/3/4/4/134486806/e4f043.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/3119277.pdfIn PDF document text
    • https://mavekajokirusap.weebly.com/uploads/1/3/1/4/131437454/1977339.pdfIn PDF document text
    • https://miragitoketulo.weebly.com/uploads/1/3/3/9/133997248/gokigonag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tazijebep.pbworks.com/f/how_to_replace_thermal_fuse_on_amana_gas_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d9592a-4fe0-4910-93de-6ae30c1066aa/advanced_excel_formulas_with_example_2013_download_free.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144418242/the_pmi-acp_exam_how_to_pass_on_your_first_try_iteration_3.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/42387582696.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144412422/how_to_fake_a_doctors_note_for_school.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/can_yoga_increase_height_after_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb99ad8-5fb2-4fef-a1ca-dda175f71838/oreck_proshield_air_purifier_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d7e527-a4a2-4fb1-8219-13c032e978cb/82360825032.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144447117/86431303533.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/arc_length_area_of_sector_worksheet.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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 5244 bytes
SHA-256: fe8e0136a279579dbd1087678ed97f51d82fd911c0e47e03e2c4b7a59b4584a0
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 10508 bytes
SHA-256: 2b0df4d4a1434b1468952f63d4b0f09cee8996a94763cb12c218d79197579d34