Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9fe77f2885d38f…

MALICIOUS

PDF

80.2 KB Created: 2021-06-09 23:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5c3e778e0883accf198aad3bd6d2cba9 SHA-1: 72dbeb52848ba4b86742d52998dd67dbd07a8adb SHA-256: 2d9fe77f2885d38fbc721ec38ac022acd8f61e7ac68a80642ed3c93bb1e127dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or link-farming operation. The embedded URL 'https://allytemp.ru/pbw?utm_term=matrix+3+tamilyogi' is a primary indicator of compromise, likely leading to a malicious site.

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://allytemp.ru/pbw?utm_term=matrix+3+tamilyogi PDF link annotation
    • https://dozumudokasalog.weebly.com/uploads/1/3/4/9/134902229/tinaxoja-nolizokomufegip.pdfIn PDF document text
    • https://xedijekotaz.weebly.com/uploads/1/3/1/6/131606072/6082030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_602cb29d0a91e.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/2122791.pdfIn PDF document text
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/davivesanipel_sexipurexabo.pdfIn PDF document text
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/fec7b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_600f974174c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_6031f42e8b7fa.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/70d6c63f-8671-4258-8bb5-7b0e6185069e/1253334066.pdfIn PDF document text
    • http://bolejagum.pbworks.com/f/orbital_notation_diagram_for_arsenic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1e16d5-da57-4443-88d5-cdfea0608295/he_is_known_as_the_father_of_western_philosophy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8aa9de-c7cb-4b94-b0f6-b05bb5eb7dd0/how_much_does_a_detective_make_in_ireland.pdfIn PDF document text
    • http://disisopaz.pbworks.com/f/wizedegebobiweduxoveporu.pdfIn PDF document text
    • http://podimil.pbworks.com/f/spelling_power_grade_7_answer_key_lesson_5.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144463029/68259686578.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/w/file/fetch/144549447/wuradakogakejun.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144585216/android_app_run_on_linux.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011453.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11453 19300 bytes
SHA-256: cd4a1117392cac19f04bced7836388f8acd2732abfe0711320c2a4059985af08
font_00_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 3208 bytes
SHA-256: 72a04668198c5005937468e42062f9a86a28ece7a649756247bc36b14170cd68
font_01_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 5168 bytes
SHA-256: dc286a6342e6b92ab86525d6881290c14af66f694e8bbd0da5f768fa33363529
font_02_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 10000 bytes
SHA-256: a7fcf555e3f236a68f881e15f242a684ed0d4e7c7d461087c9f3fe640d075d50

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