Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8f547795953d07…

MALICIOUS

PDF

109.3 KB Created: 2021-05-27 09:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1235ef1be23f71e5fd348c6baf5560b0 SHA-1: 7c4c69f482fb32871ac3abbc61911f265a541b1c SHA-256: 7b8f547795953d078a24d23ad1aa26f4afd6eb0b814688236bd435584389382d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The primary external URI, https://ponafet.ru/strik, is likely the destination for the phishing attempt, disguised by the document's title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=volume+and+surface+area+word+problems+answer+key
    • https://cdn-cms.f-static.net/uploads/4408984/normal_601ad6aa76091.pdf
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/momefa.pdf
    • https://cdn-cms.f-static.net/uploads/4485569/normal_6047b07e69594.pdf
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5fe85757c10e2.pdf
    • https://cdn-cms.f-static.net/uploads/4477623/normal_60677bebf3557.pdf
    • https://duvugatezema.weebly.com/uploads/1/3/4/6/134650783/mogufawuva_muwefesejotum.pdf
    • https://cdn-cms.f-static.net/uploads/4408584/normal_601a11aa2f540.pdf
    • https://cdn-cms.f-static.net/uploads/4449397/normal_6045be091ee07.pdf
    • https://xepekozodixati.weebly.com/uploads/1/3/5/3/135346226/d45ffd8fa6.pdf
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fcf8790e76d7.pdf
    • https://cdn-cms.f-static.net/uploads/4446285/normal_603669cd4c0d5.pdf
    • https://static.s123-cdn-static.com/uploads/4475875/normal_5ffbe014ad2e9.pdf
    • https://welarozukakiwa.weebly.com/uploads/1/3/4/4/134497755/619d7bba.pdf
    • https://cdn-cms.f-static.net/uploads/4416666/normal_603f68130ce2b.pdf
    • https://jesabison.weebly.com/uploads/1/3/4/3/134379325/96a26575.pdf
    • https://gadetuzajuvi.weebly.com/uploads/1/3/4/8/134850054/pigarunaji.pdf
    • https://cdn-cms.f-static.net/uploads/4444092/normal_600e4c1f21601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0cb1f556-5e19-45df-886c-729060a2a744/supersonic_tv_dvd_combo_reviews.pdf
    • https://uploads.strikinglycdn.com/files/81dbb5f6-8f6e-46b1-9f74-6e456822d88d/puxawavinibeto.pdf
    • https://uploads.strikinglycdn.com/files/ff1c92ca-72f6-4e2d-aa25-e624e687133a/zodaredagagojerugigabeze.pdf
    • https://uploads.strikinglycdn.com/files/6b19e442-94fc-49f5-89bd-d524ecc2ca74/wukafike.pdf
    • https://uploads.strikinglycdn.com/files/069bc72f-6f5b-4a8b-beef-1981149c72e9/wabowosupemipuweduge.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013581.bin
edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 6440 bytes
font_01_sfnt_off00014546.bin
009cc5d7cb7143c08cca283ae68cabb1f91f43d94ba816290241fa0633b4b492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14546 3664 bytes
font_02_sfnt_off00015152.bin
54160e383bf7f2e10ecb2b61e597da542dd825d9e289243b4f9e599301d3b668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15152 5664 bytes
font_03_sfnt_off0001649a.bin
a43d31875e071b90269bef20c7f43e64cb97553a0491fc8d4c6417dc934db5a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1649A 13932 bytes
font_04_sfnt_off000191bf.bin
3c1c7bd747a9a8f6e1c531457064e9378d9a893e5271ac7381d9d0015290d8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191BF 16088 bytes

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