Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcf83d32d7a3731…

MALICIOUS

PDF

75.1 KB Created: 2021-03-17 20:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 94f05f89ab48bdba0cb4ecd06fd50dee SHA-1: c06dcbccd1c9b458313e4d25a6956fa44434e0f7 SHA-256: cdcf83d32d7a37313888c34024dea7828b03fa8466b6cb703ffb3a34f7b80e20
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9997

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.
  • 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://xezojetit.ru/123?utm_term=zollinger+ellison+syndrome+pdf PDF link annotation
    • https://cdn.sqhk.co/kewudomavave/agh6iju/pulse_oximeter_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/icaMUwP/metropcs_login_account.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/Sgiidje/gavefilala.pdfIn PDF document text
    • http://kelirajisob.66ghz.com/55705153855.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/uQgd4B4/57909243582.pdfIn PDF document text
    • http://wipineda.iblogger.org/free_html_templates_w3schools.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/XEgckhc/gimogidejonijorov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_9467425e327943dd996546a429674fff.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_659bb5f454c04faf8536f461d8281eb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a05d2d3-699d-4652-ae84-c2102f68dfce/paxevetarakeruzotuf.pdfIn PDF document text
    • http://vojuzegi.epizy.com/66537666639.pdfIn PDF document text
    • http://dekamikopegem.rf.gd/bugatti_chiron_performance_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeba3ecb-bed9-4d1e-a664-7b10e8207dcd/healthy_banana_smoothie_recipes_for_weight_gain.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_14950a8d553e49708361f8edfbf79211.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_479ae2ba69e44e2285ee5ba0adc89911.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_0cc32fbce1d04bc9a3122e84eb9ec1b2.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_dad8e5407b16494a9d542a52b57165b5.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_67728c3e42b54c56b1003191a9a2e6f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9fad4b-2f75-4758-b0f2-57abcb03abaa/biremakuko.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_5eaaaa5aac2c4936a4c5241d68c635f3.pdf?index=trueIn 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_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 5208 bytes
SHA-256: ae9294ab20c08f3937b6ef89741042156c89b0bc92c8f220df20ee05ea9ad85d
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10492 bytes
SHA-256: e9344c6da7cd261ca086510e0713aa5073c8e319f83bde5b0f7045debcbba8d1

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