Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f54840ec85102a2…

MALICIOUS

PDF

81.8 KB Created: 2021-04-05 13:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6f811c71a9b3849ac6f501e4b13f1357 SHA-1: 582fb616e0500371062deb9988d1feffd72d6ab8 SHA-256: 8f54840ec85102a2e81b8a98778b439beef5a82352b360264f432a1e550ab433
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm heuristic further supports this, indicating the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=proving+trigonometric+identities+problems+with+answers PDF link annotation
    • http://kejumazinanu.mywebcommunity.org/dotisedunitobokoko.pdfIn PDF document text
    • http://sehq.xyz/ge_spectra_xl44_error_codesemc8k.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/bakaruvudemijofu.pdfIn PDF document text
    • http://texivej.sportsontheweb.net/pappus_of_alexandria.pdfIn PDF document text
    • http://pasendapp.online/are_there_any_bison_left_in_americatki86.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/33725.pdfIn PDF document text
    • http://bilkan.fun/honeywell_home_rth9585wf1004_manualzp5o8.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/rugedofazoxasaz.pdfIn PDF document text
    • http://merovew.xyz/when_we_dance_sting_lyrics_deutsch7t0iv.pdfIn PDF document text
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/f74278.pdfIn PDF document text
    • http://usene.xyz/tamorirutujafolokuvew2z00c.pdfIn PDF document text
    • http://detonic-italy.website/s-_130_instructor_guidey3at5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_d7ea7477fd8a43f08cb8db0b59860834.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/pl_sql_developer_jobs_in_chennai_for_experienced.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_24bab7c4aeb1454e97391c7f9f79f689.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamibis/bharat_mata_ki_jai_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/24634877748.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_e61f1cd1bcd0470983e56a9135f638ef.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 5568 bytes
SHA-256: 28b93e40419cd0ed2395bf4c7b7ae16553d1f02cf0346cdf72f77db8c9d4c23f
font_01_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 11604 bytes
SHA-256: d4444f6e167e93f477c529d6cc1fc56cdc68c08deb2aec28304e700cbde6d430
font_02_sfnt_off00011455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 16132 bytes
SHA-256: 3b00c875296cd7948f94e693f4f20825e266904f017ce4ebe192e2710675cbfd
font_03_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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