Malicious PDF — malware analysis report

Static analysis result for SHA-256 981b30869fe623f5…

MALICIOUS

PDF

93.7 KB Created: 2021-03-20 09:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e3d23c3b3e4a795755ec520dcf0afcb7 SHA-1: 54e8ef833e7091d009b905965360e2fffabe8665 SHA-256: 981b30869fe623f5ae7cf038fd38971f61f3b183e1d03fbfdbe7d10ed90134fb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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.
  • 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://lozipotod.ru/strik?utm_term=avadhuta+gita+tamil+pdf PDF link annotation
    • http://kino-vezde.ru/youtube_offline_video_downloader_for_android6abfy.pdfIn PDF document text
    • http://stc-l.ru/death_race_3_torrentkqhtb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_60257f38a2ae3.pdfIn PDF document text
    • http://impergamon.com/mortal_engines_review_kermodetud9v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384649/normal_600828b52dbe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_601bfa40b9763.pdfIn PDF document text
    • http://cmb-societe.com/fimelanotaponanapabevitgf5ln.pdfIn PDF document text
    • http://beremoter.online/67555477688ql6mu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5ffea90a651e5.pdfIn PDF document text
    • http://cmb-accueil.com/tm_ac1900_merlin2eayu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/how_to_describe_cold_wind_in_a_story.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_c9ecce0566dd4fcc809a1308f22431ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desenaz/infinitive_phrase_worksheet_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/manual_design_of_residential_building.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_fdb1553de8fd4f60bd4582e7fd94030a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/git_cheat_sheet_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/bushnell_neo_ion_not_charging.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 5228 bytes
SHA-256: 8532a6c045c9758a3c48788a28acabaffefdc49757a056f74352269160b56df8
font_01_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 21492 bytes
SHA-256: 7ccc2c64772cc5db9418bf32f91de283d5359744c0082631a3ee427aa597093f
font_02_sfnt_off00014476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14476 10824 bytes
SHA-256: dd43b24cd317b6058f02fbcec0ff421ffdf2b6c1b8a84b9b1a8bcba08f5e7640

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