Malicious PDF — malware analysis report

Static analysis result for SHA-256 6528dd13adc3416d…

MALICIOUS

PDF

78.1 KB Created: 2021-04-20 11:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb6f1b61cb2562889ea9d9946e796ba3 SHA-1: e068b0b9906292990ad44b36dbb88774a367ab6a SHA-256: 6528dd13adc3416d11892f51ea462facbd4f16e3368fabec4d5337073e1c8404
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://pelibifir.ru/strik?utm_term=ryobi+scroll+saw+table PDF link annotation
    • https://cdn.sqhk.co/fakozunada/iLjcLjj/fleischner_society_guidelines_2017_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/hgifXgg/dead_effect_2_apk_obb_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxofudaz/gd4igpx/camino_ingles_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/dXzHghN/2pac_hit_them_all.pdfIn PDF document text
    • http://nogibuxaniru.iblogger.org/jojadowubor.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/duseponimeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5ff4539e331bf.pdfIn PDF document text
    • http://kanudivuvim.iblogger.org/fuberawamib.pdfIn PDF document text
    • https://fefezotexarij.weebly.com/uploads/1/3/4/2/134265886/samenajerojajewog.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/hhhPF4L/story_saver_for_instagram_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/hdjfKgj/score_sheet_basketball.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff415db0ac4c.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/yN32ggp/duo_mobile_for_android_4._4._4.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/Dhf8dBQ/gacha_life_edits_girl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_606061707fd44.pdfIn PDF document text
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/xefofotefevose.pdfIn PDF document text
    • http://jinokonur.22web.org/what_are_the_200_most_common_words_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5ffb820fad370.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fdd3e8cac6e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_a1333e2cdbdf4547b75414dde2d3a562.pdf?index=trueIn PDF document text
    • https://9d03b195-5c34-4993-8a23-519dd2bddccd.filesusr.com/ugd/9ac058_7c55627ff885458fadf973b6c88058dc.pdf?index=trueIn PDF document text
    • http://merapuw.epizy.com/48204279071.pdfIn PDF document text
    • http://ribipusoj.rf.gd/81634117566.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_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 5136 bytes
SHA-256: b2a8e3757bce694e5f1b4ebdee45eb456223f51cb01447a2d90b4758dc1e2306
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 11284 bytes
SHA-256: c2355b381b343f6c087cd4be17a751c1e69dca881c1e73f070be2ee6ed938fb3

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