Malicious PDF — malware analysis report

Static analysis result for SHA-256 9838d141e12dca8a…

MALICIOUS

PDF

67.7 KB Created: 2021-03-24 04:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 539d91b163f7daf8cf54c9531d287670 SHA-1: 82eb601f141167d9f853dae45d5dcfcaeae49e83 SHA-256: 9838d141e12dca8abe23ce840e32e919eb7e88d289da5b77f4b1c3df23ba05ad
186 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 0.9993

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://dugedepap.ru/wix?keyword=bosch+she3ar56uc%252F08+manual PDF link annotation
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/lejadevevilobufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fd1793f4611b.pdfIn PDF document text
    • http://znatural.space/star_wars_jedi_training_academy_disneyland2gmm4.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/b866e18282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_5feef2768505a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_601e031517deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_6018a5cdb27c8.pdfIn PDF document text
    • https://rilolani.weebly.com/uploads/1/3/4/4/134459611/741a4b085767.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/ijggeih/86147604967.pdfIn PDF document text
    • https://folitovuf.weebly.com/uploads/1/3/1/4/131406115/wilexarenewam-rezibog-vawaxuba-gupowobofaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6019c8b911db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_604e9214d2618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5fdf7c824a853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_600743c73f2a0.pdfIn PDF document text
    • http://creditstar-kabinet.com/why_is_my_lg_washer_making_a_grinding_noisep6rky.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/d9QWifQ/26780132408.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/wipusafax.pdfIn PDF document text
    • http://zajowuresa.iblogger.org/sojewa.pdfIn PDF document text
    • http://acgmgroup.ru/95488692058dgcsh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_604d6ca9909b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunenunewu.rf.gd/duzesizesujafezeget.pdfIn PDF document text
    • http://toduwez.epizy.com/tavusu.pdfIn PDF document text
    • http://vaxuxabupuj.epizy.com/27199175889.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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 5900 bytes
SHA-256: 74e807abca3e99a542f8af2a14e67e4a1915634fe5c8ec134b7859f6dbd885d8
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10432 bytes
SHA-256: 242a15dfad9c9265067a3e75753fad1df9c8d418fc84635aa10c46ae3566af40

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