Malicious PDF — malware analysis report

Static analysis result for SHA-256 de49bf017828f23a…

MALICIOUS

PDF

72.1 KB Created: 2021-03-22 12:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d40d0b1c558043970fa9a76a8fda5c4 SHA-1: d35d78683b2c5b3205133b10fcb171630d3f687b SHA-256: de49bf017828f23a01d4cee2848cb214d06fd793a49252c96d92880a95d44a7c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://nipisod.ru/aws?utm_term=how+to+remove+a+partial+denture
    • http://jurojegame.getenjoyment.net/cintas_first_aid_catalog.pdf
    • http://lotukaguw.sportsontheweb.net/ano_ang_bionote.pdf
    • https://cdn.sqhk.co/fotinegataso/FieLVji/bloons_monkey_city_2nd_city.pdf
    • https://cdn.sqhk.co/porekige/jeEhcig/world_overseas_filipino_bowling_tournament.pdf
    • https://cdn.sqhk.co/gogojiranat/ChemufM/31852881936.pdf
    • http://xawamiwupajev.mygamesonline.org/19049291215.pdf
    • https://cdn.sqhk.co/zatejurix/Yjcdjdw/45349113912.pdf
    • https://cdn.sqhk.co/xubewarow/3Ggjias/nowuwenuwadetem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/22e17777-873e-4777-ac78-459a849f1233/1008_names_of_lord_vishnu_english.pdf
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_b9ff020fc912460cb597b5d718d1dff3.pdf?index=true
    • http://vamudijikepefos.rf.gd/61182871968.pdf
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_d6f30050c92049e6b348dd9dd35eac25.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1871df89-add3-498f-9f82-00270ebee820/win_10_free_microsoft.pdf
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_c46130d9a2af44da82a4a91c0534681f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2da14e2b-b9f0-4e11-a017-584ebfaa3f56/42962322475.pdf
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_0da7054483b44813bbe8dee508a295a4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3c1d864-1e39-47a8-96d7-c7d31312cabf/frases_de_cien_aos_de_soledad_libro.pdf
    • https://s3.amazonaws.com/ratixifo/46607735896.pdf
    • https://s3.amazonaws.com/wiwuxot/bergeys_manual_of_bacteriology.pdf
    • http://judiserod.onlinewebshop.net/72367973948.pdf
    • http://kasafufakariwe.rf.gd/cutting_board_plans.pdf
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_726b43fd5e794dcf88a9fc419b7c02a1.pdf?index=true
    • http://wusumuforibit.epizy.com/best_online_english_speaking_course_for_beginners.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/tikobakuwunefiremuj.pdf
    • 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_off0000ddc2.bin
f139420c5020637feb3b3f003e99b5904c8a33c40b58e3ae6d11440f281dff97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 5040 bytes
font_01_sfnt_off0000eede.bin
16c9446fc53123ab44cdbdaff606cf471b5df33a1e050a99e60d5cc92cdc19b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10660 bytes

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