Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8d5b2b3b7fca50…

MALICIOUS

PDF

78.8 KB Created: 2021-04-25 14:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7d460c5d0ecbd577eb867b049bc91b7a SHA-1: 2025a2a1b03e1600f50643f12b8d5f90d8ddaf4e SHA-256: ba8d5b2b3b7fca508cf302a5639df2b7672f6631e8996b1be3bb51185b332d5e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external links, including a primary suspicious URL, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, appears to be a lure related to engine carburetor settings, likely to trick users into visiting the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=tecumseh+5hp+engine+carburetor+settings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4528780/normal_6033f3c7a4ac5.pdfIn PDF document text
    • https://lexebovet.weebly.com/uploads/1/3/4/6/134628591/c39838255bf62f7.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/3131777.pdfIn PDF document text
    • https://rujusuxiledajo.weebly.com/uploads/1/3/4/8/134861970/6348289.pdfIn PDF document text
    • https://bodumiwi.weebly.com/uploads/1/3/1/4/131406735/tatiz_golano_nikasipiboparo.pdfIn PDF document text
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/mepumebelas_risobifasukow_wovobesizaxed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_5fd09facc53e9.pdfIn PDF document text
    • https://tefegori.weebly.com/uploads/1/3/1/6/131637168/69d24c51bc5870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_cdcfc5f9b45847fb80eeb193bd447965.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_b95023a9084f4d6e901189d4c7abadfc.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_c222ff6192a841ce85520c5b8c4f61c9.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_08c17f794799452b9fb648c396e9d3ea.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_267b68f1edc9403dbb67f45e65145a22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorogamat/40420297978.pdfIn PDF document text
    • https://ce419959-236d-4487-89d7-67f356bda573.filesusr.com/ugd/147b51_b2fb713b03b54f5987e7104988f0ff16.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_7e66cca20821437ba793c1520eadc53d.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_16a622a8966c4b339b00ebc541664e4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/expediting_your_prayers_from_the_courts_of_heaven_robert_henderson.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_bbec765f4df040c79c78da08c819f0a9.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_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 5528 bytes
SHA-256: f1ec3e2708d87cc562517273e8a1cc8eb3e1b103bdb1fd4277f17924752d3b6d
font_01_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 10668 bytes
SHA-256: 055e0dca4436a40dbe51a933ce1d3d5baf01599819093c41d1eb0e7c1829eabf