Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38553dd3f86849d…

MALICIOUS

PDF

117.6 KB Created: 2021-05-12 18:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1c90e142479d08e1f21eb57558a48774 SHA-1: 89027650801241815d544a437b7ec506d2431463 SHA-256: c38553dd3f86849dab92179e60e44e028b59771ee45397b366edb3872f716008
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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://soxebez.ru/strik?utm_term=what+is+the+book+of+moses+all+about PDF link annotation
    • http://flowerport.market/how_to_clean_an_old_singer_treadle_sewing_machinen261c.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/lakuketeramobijep.pdfIn PDF document text
    • http://health-top.ru/93172955123ykt1m.pdfIn PDF document text
    • https://boferisavupase.weebly.com/uploads/1/3/1/3/131384298/133736.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/letigiwepif.pdfIn PDF document text
    • http://a1metromovers.com/is_krav_maga_safeb0i4c.pdfIn PDF document text
    • http://supfitket.buzz/spotify_account_checkeroiowk.pdfIn PDF document text
    • https://zemilogafolot.weebly.com/uploads/1/3/4/0/134096074/lepesexuzevej.pdfIn PDF document text
    • https://putojedenavaxo.weebly.com/uploads/1/3/2/6/132683165/sekekuvejep.pdfIn PDF document text
    • http://datifuxevewa.22web.org/lamudapipapagenifimisa.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/03d22402.pdfIn PDF document text
    • http://fakokodatega.22web.org/tafupu.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/8011170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vagaxalelevirot.epizy.com/19293161126.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/gewekud.pdfIn PDF document text
    • http://duxiwosozudut.epizy.com/80902701253.pdfIn PDF document text
    • http://kikevanalujik.rf.gd/47624442945.pdfIn PDF document text
    • http://serulasev.rf.gd/lesewim.pdfIn PDF document text
    • http://powosegunivu.epizy.com/74250465718.pdfIn PDF document text
    • http://reguturutomasut.rf.gd/dajomefumol.pdfIn PDF document text
    • http://duzixaludu.rf.gd/dewewukedugelolamuvuman.pdfIn PDF document text
    • http://zefifimagami.epizy.com/mavedadugulej.pdfIn PDF document text
    • http://midelex.epizy.com/daily_accomplishment_report_for_ojt.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C8D 5128 bytes
SHA-256: c5fdb96c1b5c79e1d7c1a3ee56e59b16b05d9fad92e7ec280212bbe5f95edf90
font_01_sfnt_off00018df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DF0 10816 bytes
SHA-256: 4380c414c10f1ebcf225a17ae6fa376f16bf55357938ceef54a2fc7d8219f91f
font_02_sfnt_off0001b2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F9 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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