Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8f7d14ad5c78ce…

MALICIOUS

PDF

78.6 KB Created: 2021-03-07 06:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d46ef50f8e092301e5072a059bccf53 SHA-1: d1e97a785eb130032ab69435d86ec3539cb69d56 SHA-256: 7c8f7d14ad5c78ce807344c171fbb20cbed3bb82425dc03b8c1909a10e0169ec
156 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 0.9994

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://xajibur.ru/strik?utm_term=best+homemade+juice+recipes+for+weight+loss PDF link annotation
    • http://telgrm.site/5285823358450uy1.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/hhhfieR/griswold_inn_thanksgiving.pdfIn PDF document text
    • http://winoraama.fun/tofabesubivosogowovagelmqfm.pdfIn PDF document text
    • https://cdn.sqhk.co/bexikerez/A80qiay/65883365301.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/9fb506cb2ef4.pdfIn PDF document text
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/b85ba2ba.pdfIn PDF document text
    • http://tajevis.22web.org/91567278623.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/Tafric3/86741781055.pdfIn PDF document text
    • https://dezamemev.weebly.com/uploads/1/3/4/7/134746632/nawukir.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/ejhiaji/15675196574.pdfIn PDF document text
    • http://hushseo.online/binomios_con_termino_comun_ejercicios_resueltosrxan1.pdfIn PDF document text
    • http://milansit.space/no_fear_shakespeare_macbeth_act_1_sc_5vr3w3.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/levofitelivew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_cab216fcfeee41429379e77d9016bee6.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_10656fa6b08d49b4a912e22ad814b2dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/49524218691.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/83827399326.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/61620726538.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_fa63f857d4924ccb93b1ce962155c414.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_9e5d4fe1fcd54055a8410e97f6ec915a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/safe_android_emulator_reddit.pdfIn PDF document text
    • http://fujesotes.epizy.com/ppap_manual_current_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/best_nes_android_emulator_reddit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 5784 bytes
SHA-256: 2884fc4f82cd1fe77f21955fcb35381585f7bac699b827bdd039b73c1c9d891c
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 10504 bytes
SHA-256: b33333238cc0b3ee1a27a211192f2a25c9241f8f1cb958ee10d5a1c7d45e8a10

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