Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cd37c1bc34eb10…

MALICIOUS

PDF

92.6 KB Created: 2021-04-06 00:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7ee7b04c11a9e36588d24d1fbbcb933d SHA-1: 259c30327dfcfeb87730024ca4d7dcd7d6dc60ba SHA-256: 75cd37c1bc34eb1031a21fc08b056a715cc96d0a54d73fb75b876e18d2bfbcf6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. While the document body appears to be garbled, the presence of numerous links to external sites, including those hosted on Weebly and other free hosting platforms, suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://ponafet.ru/strik?utm_term=how+do+i+fix+the+timing+on+my+kenmore+sewing+machine PDF link annotation
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/boxizovexazitem_pokelituni_nujas.pdfIn PDF document text
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/66dfe46f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5ff274f394c0f.pdfIn PDF document text
    • https://dixetomik.weebly.com/uploads/1/3/4/7/134775969/324085.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5ff371aa90b16.pdfIn PDF document text
    • http://fizadote.22web.org/rarijapikujomekevokudizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_601f57a0bdd06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_6038fbc199f79.pdfIn PDF document text
    • http://gefivinolegaz.22web.org/71401745146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_6017118a08583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5feefa7245aaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5ffbece113349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_6069fcb9bfd92.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/morarut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_605a27208f9be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_6059e84e5d1f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5fdd2c53d7f2e.pdfIn PDF document text
    • https://lifadupelede.weebly.com/uploads/1/3/5/4/135401245/9d41b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suzawelo.epizy.com/2010_chevy_camaro_manual_transmission_for_sale.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_ac4d4c209196445db2b556954970f278.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_c1be96253e3b4e1cadf78bcf063ac6a6.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_076a3c514d29438e852336dc924aa1fa.pdf?index=trueIn PDF document text
    • http://zomekijisev.rf.gd/bible_quiz_and_answers.pdfIn PDF document text
    • http://jirunogi.rf.gd/bollywood_song_mr_jatt_2019.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_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 5688 bytes
SHA-256: 06ea63a8a56ca0a3fa6c380cb6859735f716157f2b595c3612028a11793178a3
font_01_sfnt_off00013e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E71 11364 bytes
SHA-256: 75bd1ea381be6d811a3daec034777d9614304eacbd8a3dcfc2aeed5411a23faa

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