Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87699df60e4311f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-19 00:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c29eb23cda7fe5584fd971d6c08472d5 SHA-1: 1ebd1ce5349b62a3353119cb629a46425ccd0999 SHA-256: d87699df60e4311f85a20f97207181fe24b1cf929fa3d28eb1de7b1981bbcd26
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with one prominent URL pointing to 'druttle.ru'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of many external links points towards a phishing or SEO manipulation tactic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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.
  • 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://druttle.ru/wix?keyword=footballer%2527s+ankle+recovery+time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463812/normal_6053c0198f08c.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/f44c8a6977f18a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fee1fb6f30a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500450/normal_6040b673c1e06.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/e3c4fb78fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_60439ca583feb.pdfIn PDF document text
    • https://tejojobowadame.weebly.com/uploads/1/3/0/8/130874570/5690551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5ff65bf33ea0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_603a4a998e009.pdfIn PDF document text
    • http://medicalpracticementor.com/jivusexutazajenufuwivea7m0j.pdfIn PDF document text
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/6206559.pdfIn PDF document text
    • http://reduslimitalia.website/list_of_feeling_words_for_adults15ikb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_5fef4e56da9ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_603868bdd53e4.pdfIn PDF document text
    • http://busforpay.online/how_much_does_colonel_in_air_force_makero323.pdfIn PDF document text
    • https://zaderurumanig.weebly.com/uploads/1/3/4/5/134588260/sirefivod.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/naxanegato8qzs6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fceea927d6c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dusipesubabaf.rf.gd/tintin_el_congo.pdfIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_a121fc0101a34d39b0b631e18a29b99a.pdf?index=trueIn PDF document text
    • http://bexopikirekide.rf.gd/75275073871.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_37c496316603473e96e948f23436d0a4.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_1115c5daadae4bbda6bc11278c5b6344.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_fa6cfc2984aa48709cc134d9fe6d0ec4.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_b60c20aacb6f481cb3cb84c6aeb66e36.pdf?index=trueIn PDF document text
    • http://tabifewegijip.epizy.com/98488981329.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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 5300 bytes
SHA-256: 924d90f3da5e86fefb7026b9346e7d50b78fe3d6d7c1d4707cdc9b746812c300
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10320 bytes
SHA-256: 09bd66b23af8aa53ed7d786c83c17f8caf1d736f15aec22cad09c9b599d5ec07

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