Malicious PDF — malware analysis report

Static analysis result for SHA-256 8021cdfaba6f5b26…

MALICIOUS

PDF

78.2 KB Created: 2021-03-19 18:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e958de791f667c2ed11708c93a49a5 SHA-1: 73df3ae24e3f888e474b1839559662ca0b98ea21 SHA-256: 8021cdfaba6f5b266d8ee735805f21d8433dd37c6097d9d338b2f1ad7c020e64
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detected it as Pdf.Phishing.Trojan, and ML classification strongly indicates maliciousness. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, contains references to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=stihl+bg86+blower+air+filter
    • https://cdn.sqhk.co/dakuwuwuzije/hjR58q6/sprint_international_calling_and_data_plans.pdf
    • https://cdn.sqhk.co/kajurineg/ghRgfgf/gizosunoragavomenavorig.pdf
    • https://cdn.sqhk.co/nilubasikufa/Ggghahe/android_webview_tutorial_2019.pdf
    • http://bulakirip.getenjoyment.net/adeste_fideles.pdf
    • https://cdn.sqhk.co/pixorikibam/arAyMtM/77553174648.pdf
    • http://mujubow.getenjoyment.net/how_to_fix_a_jammed_paper_shredder.pdf
    • https://cdn.sqhk.co/jisokemefaz/NjdthWq/jowifonezowozunalumiku.pdf
    • https://cdn.sqhk.co/kifukuvitog/j1giOTx/war_robots_gameroom_download.pdf
    • http://wepijafiguwenan.mywebcommunity.org/81317407260.pdf
    • https://cdn.sqhk.co/wawerugile/TjcSha3/brimming_synonyms_and_antonyms.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3efb0652-b2cc-4f3e-9989-fa18d47aae8e/15637954663.pdf
    • https://uploads.strikinglycdn.com/files/987152cc-07de-458a-926b-616318f7a6fd/44821434883.pdf
    • https://uploads.strikinglycdn.com/files/af01baa1-932f-49db-9b5b-14deb715fe6b/how_to_reconnect_kasa_smart_plug.pdf
    • http://xomutojekes.myartsonline.com/african_american_history_timeline.pdf
    • https://68ae4677-0699-4037-924b-cd06d5955ced.filesusr.com/ugd/55f640_06f594e18e824c2db231ed7adc7ac68f.pdf?index=true
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_86ace501e6b24c2bb81c5371363910a0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f360.bin
e5f9a9fece0b7dbe4be97ca2da493ed4356a91c963916d655566948a7914894d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 5536 bytes
font_01_sfnt_off00010644.bin
329741698409df49d0cf4660ca157216d0904f2513feafc919398e89d71edc09
pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 11096 bytes