Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdfa48fb91ff617…

MALICIOUS

PDF

96.3 KB Created: 2021-03-15 01:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3edf7263a9b1e11294a284346b1839ed SHA-1: 96fe8e1dd3bea99cf774e8771013d2d5849611da SHA-256: acdfa48fb91ff617b69b56e6f65aecd095693c7b73478ea5edc75ff7673b86ea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution vehicle. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure strongly suggest an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/123?utm_term=algebraic+expressions+class+8+cbse+worksheets PDF link annotation
    • https://cdn.sqhk.co/xozirijor/jSgjjPK/download_run_race_3d_mod_apk_revdl.pdfIn PDF document text
    • https://fidenuta.weebly.com/uploads/1/3/1/4/131454859/76f274.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/kZKPzjj/senator_doug_mastriano.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/maseparebe.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/RjbfGjd/76215877847.pdfIn PDF document text
    • https://kutepazibug.weebly.com/uploads/1/3/4/4/134477769/6607237.pdfIn PDF document text
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/bexerutom.pdfIn PDF document text
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/ab41da.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/AAgjChi/mewanawalatexesuja.pdfIn PDF document text
    • https://najabokaxosol.weebly.com/uploads/1/3/5/3/135300306/79885ae9256d7.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/duxodidikop.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/uhbYmzF/ant_smasher_unblocked.pdfIn PDF document text
    • https://nenafefetu.weebly.com/uploads/1/3/1/4/131406263/xelopagekexelu.pdfIn PDF document text
    • http://nubupexajed.iblogger.org/a_practical_guide_to_evil_novel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a190fbe5-2e42-473d-b294-678737fb69b7/parent_partners_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa52326-f4c0-4f59-9352-a27e743abfb9/what_is_the_difference_between_elite_theory_and_pluralist_theory.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_4f0b99184b3249fe87bcf09162fff6f1.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_951f27e4ac8e402584f67cad005f0701.pdf?index=trueIn PDF document text
    • http://jamurujitexezi.epizy.com/monkey_balloon_game_free.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_ad041161a4174da295e3df8ed9403d6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f94a256-a69e-4ea8-b038-b06bc11916b1/fikuwizuvuf.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_77a7906844594e918ea88425e2950885.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_78fdfe9ee95c40169692ab80fef5d016.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_off000137f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 5740 bytes
SHA-256: f4e762a0bccf1a11508ab490de6fe08e040b43f3c875ddf380c655ad0194d034
font_01_sfnt_off00014b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B93 11732 bytes
SHA-256: 018f05c058a23cf85fef53e24dbf5d44b7e27a405c9f2ffbdd9c29cafd910d23