Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37c9e7dffe3cd23…

MALICIOUS

PDF

71.4 KB Created: 2021-04-07 18:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4faecbcc2f6264e0a21d20a80b1c6492 SHA-1: 23168e46567aa8a68d692d7c5548ede3d1d96bb5 SHA-256: f37c9e7dffe3cd23c2098fa217006a4bece7e927f5be238997fb00cf536e4638
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 0.9996

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://maypoin.ru/wix?keyword=dante%2527s+inferno+webquest+quizlet PDF link annotation
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/baf6563f172aba.pdfIn PDF document text
    • http://daddytestit.xyz/29826199764zjds4.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/UAhgghh/survival_on_raft_ocean.pdfIn PDF document text
    • https://cdn.sqhk.co/nudavede/ahhiPhc/redcon1_pre_workout_bundle.pdfIn PDF document text
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/8e91d9bb0dabdb8.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/nisapunokur_donuxonixeronud_moluragagi_zapokagarej.pdfIn PDF document text
    • http://bikupiribofaz.iblogger.org/the_scarlet_pimpernel_1934.pdfIn PDF document text
    • http://zoxatejisiv.22web.org/84108554996.pdfIn PDF document text
    • https://bajubupex.weebly.com/uploads/1/3/4/8/134885198/lesubefetar.pdfIn PDF document text
    • https://kunobutos.weebly.com/uploads/1/3/4/2/134234797/sumerib-kevan.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/bepes.pdfIn PDF document text
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/9134200.pdfIn PDF document text
    • http://bubble1.space/uc_browser_apkpure_201731zm6.pdfIn PDF document text
    • https://juvifopabolosat.weebly.com/uploads/1/3/5/3/135313118/5825250.pdfIn PDF document text
    • https://maradezeg.weebly.com/uploads/1/3/5/9/135974492/fofegisabop.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ijcjghh/27467302727.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/wiwumefowoxuma_vetapimovukeka.pdfIn PDF document text
    • https://cdn.sqhk.co/lebexuzo/iaidjiQ/rolling_stones_albums.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
    • http://nolazukij.epizy.com/3dsky_pro_table_and_chair_vol._05.pdfIn PDF document text
    • http://bibesatu.epizy.com/kumano_kodo_walking_guide.pdfIn PDF document text
    • http://sipisosizo.rf.gd/netgear_gs116e_review.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_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 5084 bytes
SHA-256: 77151bffda514b60d4c59900474674398a2e5c1301b0b95d41595764f06c6831
font_01_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 9948 bytes
SHA-256: 231409c4bdbe75c0916d7798bdc2ac47a4f290bc41546d7de457fd8bb8aa365b
font_02_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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