Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f442eb7c34f74cd…

MALICIOUS

PDF

84.0 KB Created: 2021-04-25 05:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b8b38875ab8db2cf2ff429f87c926eb2 SHA-1: 9ed03bd4afe95b8106ec48a2107ee0152edc0784 SHA-256: 3f442eb7c34f74cd1a84cac3cd37ee31496a4d507c75f5a0430fa9bd3f8a63a2
156 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=trigonometric+identities+solver+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475563/normal_60472b2ed5358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373505/normal_5ff62607967df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5fd9d627d7b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_601189322dfef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fc7474caaf0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5ffbd3dd0fb6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_2350b7486f4a4764a31d96b111e4792f.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_015610dde2b14afd87f808551460eb28.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_ab48b4ddf4bd46a480f7b9a98c0496b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/vonajavepogeju.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/pubepanarodew.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_0c0e98557e97460787965e9a5e0d3269.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tapexiw/94149542457.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_7ec79a68116946a985aabbd559a2dcee.pdf?index=trueIn PDF document text
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_4ee408ea782e4aa0a7ddf99bc79903f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/monthly_compound_interest_schedule_excel_template.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_f43dd36a12fb4e0c9b4889ab036f02c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/corroboree_frog_information_report.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_ceaccba2a7bb4e72babc4011104ba7a4.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_a4b3ca88b32f46ff94a48389f495993d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/old_bodo_gospel_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 4928 bytes
SHA-256: 81ec0816a7297ba930fe4011db4cac2e6cebf4be3c14f6c2f4f3da5b44143638
font_01_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 11064 bytes
SHA-256: eeceb173a09c53e15a66f30426ab6ea644ab024436d7065df5acbf523e1c1c78
font_02_sfnt_off0001323e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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