Malicious PDF — malware analysis report

Static analysis result for SHA-256 16859854732600cd…

MALICIOUS

PDF

69.3 KB Created: 2021-03-24 16:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2afa949ba3347e4a42a44d855fb941f7 SHA-1: 51a9989f42f149dd5c404d5e885ee5b407d5ab9d SHA-256: 16859854732600cd417953db6f03beea77b561718161fb8cdc09f3af23a60163
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 0.9998

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/wix?keyword=parametric+equation+of+semicircle PDF link annotation
    • https://nakafafokebupop.weebly.com/uploads/1/3/1/4/131437029/rerija.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/5238053.pdfIn PDF document text
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/katojoxin.pdfIn PDF document text
    • http://zelegurelo.iblogger.org/gexinipesebivunipeda.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/d1c68aadaa5.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/fbd0b39.pdfIn PDF document text
    • http://jijukilodo.iblogger.org/24743161109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevojekibawe.rf.gd/vajujifeziwuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc904bb7-482b-4710-b102-abe5c2bdfffe/zombie_survival_games_free_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be95fff-675c-4060-b483-4a46110ec321/how_to_check_my_license_status_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00192dc5-3fca-4c4d-9d78-a1e4ba272637/icici_best_mutual_fund_for_sip_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a39072-934f-4ce3-ad4b-2d7ae3c78592/girasaxafubujegib.pdfIn PDF document text
    • http://jonemif.epizy.com/free_bollywood_songs_songspk.pdfIn PDF document text
    • http://dukukanakimazup.epizy.com/fopapezarunipa.pdfIn PDF document text
    • http://pojesonedako.epizy.com/55619218876.pdfIn PDF document text
    • http://ninesunugata.epizy.com/83554830377.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/6188923053.pdfIn PDF document text
    • http://porumujowupof.epizy.com/blendtec_lifestyles_recipe_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/gokumepakewulogaza.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_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 5156 bytes
SHA-256: 96950a9dfe83c807b3a37a9d98b27372a2d22b9fd60d822fbf8d058020e2e3eb
font_01_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 10888 bytes
SHA-256: 293ccd8a916d18546c75f14424975b31fadd988c752a7b71cdbb721fb1db7496

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