Malicious PDF — malware analysis report

Static analysis result for SHA-256 725e9f598f91f5c9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 05:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40564fb0eae401a316e6116f565258fc SHA-1: 5b632ba36d795e0a55277fd3ccb27db654608b09 SHA-256: 725e9f598f91f5c91ca96bf61dc9f46e4ac8d8dd66cdf05dfb41598e44d34470
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://jumiwimov.ru/wix?keyword=investment+spending+in+macroeconomics+refers+to PDF link annotation
    • https://cdn.sqhk.co/nalomuxe/UFgeage/shopsmith_wood_lathe_chuck.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/fReQpH5/diy_motorcycle_wheelie_trainer.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/Lzhegip/74930177732.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/jghiqWG/elements_of_design_form_in_fashion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_603f0c685a3f8.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/11260031356.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/ieifsjb/mx_player_ashram_imdb.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/19179890187.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/28151852474.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/28107101338.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/interpreting_arterial_blood_gases.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/honda_eu2000i_weight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_6035821e56f07.pdfIn PDF document text
    • http://mugurapit.sportsontheweb.net/62860665681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limuzer.atwebpages.com/blynk_arduino_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/liwugedaxalexogonawe.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/dilawetatemesukirenuzu.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/29453871981.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/arabic_english_bible_free.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/how_much_do_airmen_make_an_hour.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/interior_design_sales_jobs_chicago.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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 5440 bytes
SHA-256: c92f1cb0e5471eba6e64f3de5f9b9fb0de5484cda0a7042bcd0335cf1c20a95e
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 11368 bytes
SHA-256: 9f707eb33cad1a0cb31695083fdcd1b422f37ac3bbe24c04c53a6d60321e46ef

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