Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88c08ec2aa66266…

MALICIOUS

PDF

99.9 KB Created: 2021-02-21 20:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 362745f78fe0172fe9eff13229f179da SHA-1: 591291c0d9661207abacea34e6b99db5276578c2 SHA-256: f88c08ec2aa662668921a0d9ec9ede756e5b447afd8e4cd5a2406615f0699d4b
204 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, potentially leveraging PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://crophysi.ru/aws?utm_term=can+i+use+canon+210+ink+instead+of+245 In PDF document text
    • http://dulomagukide.22web.org/ice_cream_machine_reviews_south_africa.pdfIn PDF document text
    • https://nijomusuvul.weebly.com/uploads/1/3/4/6/134671469/jefipaven_lipadipumemu.pdfIn PDF document text
    • http://helpcopyright-service.com/what_does_kag_meanwj87k.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/OId7jcL/70237629964.pdfIn PDF document text
    • http://tufipenuvabiwed.iblogger.org/arms_exercises.pdfIn PDF document text
    • http://tryraisins.pro/63601643569fheqy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5ff6ecf58a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5fd27a9653f8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_5fd911474cf66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5ffadce059bba.pdfIn PDF document text
    • http://lightly.store/james_destroys_diseases_website1zv2g.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/pugokaxeji.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/iggdOSx/human_fall_flat_factory_level_switch.pdfIn PDF document text
    • http://promooffer.site/xanonapigidirelanuxedsma2x.pdfIn PDF document text
    • https://doxagazezuzizum.weebly.com/uploads/1/3/1/6/131606815/c4fef777c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_5fdafdbd7d8cf.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/xukonakefules/floating_action_button_android_library_github.pdfIn PDF document text
    • http://datojotimesa.epizy.com/brawl_stars_hack_2019_mod_apk.pdfIn PDF document text
    • http://gagisomix.rf.gd/picsart_mod_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/6535843282.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_off000144e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E2 5396 bytes
SHA-256: 8fb8ba1aaa33b7b2fd0dbce0fb65dbbe714ced6bc82a7b3dfe87992893ed8bdb
font_01_sfnt_off00015763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15763 12596 bytes
SHA-256: 124bc2a931c6e0d6dcd5230648fb64134c9bde695c6c1e9255fc11df094d0ba4

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