Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e8ac3445739097…

MALICIOUS

PDF

107.8 KB Created: 2021-03-25 15:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8a4e5aad16a23b600b7e719cb15b4628 SHA-1: b9b20979cc06b0294743f8f993882f19e962179a SHA-256: 35e8ac3445739097b4b8bd5912ad3007db0e5b39b57922bae06ba105f7b209ca
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=ponniyin+selvan+story+in+tamil+video PDF link annotation
    • https://fijoxivivuf.weebly.com/uploads/1/3/4/0/134041864/milunapeseni.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/business_plan_sample_format.pdfIn PDF document text
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/sipowotubunif_wusexide.pdfIn PDF document text
    • http://dvestideyli.xyz/biological_half_life_of_iodine_131tk5m4.pdfIn PDF document text
    • http://smartcreditcheck.info/gefenefeft145c.pdfIn PDF document text
    • http://yazansoft.com/589822103849fo48.pdfIn PDF document text
    • http://naturfresh.space/muzinawitufewobafejozornmnlb.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/2d414a3a-20b5-440d-a6f8-e688717a583f/gituvoxajodono.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/47345211098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518501a4-319b-4cb8-8dc9-0bed7a4a904f/14995854402.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_2d057487b5cd4ebcb47bd9db69484ba3.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_1c228f94ba66451c856285c1894ee3fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f542fd4-96ab-44fc-8117-629cdfa63312/zipofexitaminojiputurere.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/kugepibokakiwitekimu.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_fd839548c1a445ed989d29102cb0c132.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_fe4adb77c45041d39fd42d74795f792c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f813d035-6bf2-4dba-acbd-b20bd9d5d42d/xagosinigifijugaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34fda66e-59b2-4f22-ad05-a14c8c563fcb/invasion_of_privacy_album_cardi_b.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/ad_hoc_network_textbook.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_bd6154fc3e6a4b8f9a86829a9f555fab.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000143af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x143AF 12868 bytes
SHA-256: 6f29d7d7451526b15a751e271fe4a83fe0fd8a7c87f458613b389c866b4a6828
font_00_sfnt_off00013244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13244 5136 bytes
SHA-256: d16644da5bf5a586f3ccbc41c2814a0c426d0417eca7b38b7a0667975d526880
font_02_sfnt_off000162ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AB 11468 bytes
SHA-256: 7dd53e919f02b737b49f9bbab965639b054fe0141c2c709d055c44bce2b09784
font_03_sfnt_off000189ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189FF 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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