Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7538711568f242b…

MALICIOUS

PDF

75.2 KB Created: 2021-04-17 20:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 87b653c191c1daad7b2e87e05f70ec87 SHA-1: 77b2ec06325a40dee9d03626db4547a1edbf7ba4 SHA-256: f7538711568f242b68fe71357c03666486629bc49f136f2ea3c7b9a85b3a4117
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or phishing attempt. The primary URL, https://ponafet.ru/strik, is suspicious and likely leads to a malicious site. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=spoken+english+book+in+telugu+pdf PDF link annotation
    • https://kixefumikek.weebly.com/uploads/1/3/1/4/131437490/8838d7c7b41f959.pdfIn PDF document text
    • http://podjem2.club/asus_maximus_viii_hero_price_philippinesec93b.pdfIn PDF document text
    • http://chambrehub.xyz/what_are_the_electrical_symbols_for_resistorsmg8fn.pdfIn PDF document text
    • http://meetchat.space/wanawelujevokiwofvw6d.pdfIn PDF document text
    • https://sajoviginuxux.weebly.com/uploads/1/3/2/7/132712139/568099.pdfIn PDF document text
    • https://juliraviwuziw.weebly.com/uploads/1/3/4/2/134267057/fapotewijo_naxovibiwafu.pdfIn PDF document text
    • http://aov.one/80084279640s1mcm.pdfIn PDF document text
    • http://gratoraama.website/scosche_loc2sl_yellow_wire61yz5.pdfIn PDF document text
    • http://vzroslyh.net/2006_american_buffalo_gold_coin_valueg3uap.pdfIn PDF document text
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/wuzugotaba.pdfIn PDF document text
    • http://copyright-notice-ig.com/sigakupolafafazutulure3a3.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/9725236.pdfIn PDF document text
    • http://kittyplay.online/mivewoluj3fzzv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/mcgraw_hill_answers_history.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_f5c1a5b0bddb4d6ebb010d27b98e0b7b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feseni/gakajujo.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/kakobidepagabebed.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/74298653551.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/final_fantasy_7_remake_walkthrough_guide_book.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_b182661c1c9d4900bc34749df659b824.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_771abd91ee3542d4a3f82b9ec9a16055.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 5304 bytes
SHA-256: da68381777633d1dbaa3b47cb26f3af76ba674f4f2717336ac46eedc00354607
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 10812 bytes
SHA-256: 1feb192cb5b633de363416fe3a1043491ec53e6af43e49960a84a46d248f3cd5

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