Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c2f82b07a0e32d…

MALICIOUS

PDF

73.4 KB Created: 2021-03-10 22:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d2ad5b7d33c8c73fd935def77d959df3 SHA-1: d79e0ed02f191ff008dfd60322bee85931b10719 SHA-256: e4c2f82b07a0e32d69c4a641002adfdb6dedc7f45401063f15d96badd579b351
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 0.9998

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://pelibifir.ru/123?utm_term=chop+chop+slide+song+free PDF link annotation
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/defularomupin-rugixapuwagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_601c94527a5f7.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/why_is_call_me_by_your_name_good.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5fffeb2ecd39a.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/how_long_does_it_take_to_get_a_duplicate_nc_drivers_license.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_6034fe3871b10.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/podivobogo_bibikuta.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/2537085.pdfIn PDF document text
    • https://tovibebifenoge.weebly.com/uploads/1/3/2/6/132695438/81d53f6.pdfIn PDF document text
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/pulexet_ludirilobaxit.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/85bda999-5440-4799-bb11-62f44e8d2fbb/breadman_bread_machine_recipes_banana_bread.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/awk_format_space.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/suxikobuvi.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/62870040107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f387c5cf-52ba-4c22-9c38-f91c89337773/43006629744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0168388-f790-4ced-af6a-beee438b025a/warivoxanurow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc33960-c6a3-4469-af0b-5c783c19b403/jutesisipufapusafimutev.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/how_to_stop_vizio_sound_bar_from_turning_off.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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 5112 bytes
SHA-256: 8ddcd26fdccd603d773533286dc075edd05511e9bfe0da5b444a9900d23316cf
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 10960 bytes
SHA-256: dcafc7c336e0bb40c5ed63604dd70eb7ed3501a0ada0e9ac56a24d59be5b903b

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