Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b3659d361cbb46…

MALICIOUS

PDF

71.4 KB Created: 2021-03-01 22:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 272d66191f5a7603e196aef798bc472c SHA-1: 49ad719f815ae0c6f67d5302b5f2a40cd9af3444 SHA-256: 57b3659d361cbb463dce89b1b5ae0eafa625a36177f2cc53b25bea0b79a1d875
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous external links, with a significant number pointing to what appears to be an SEO link farm. The primary malicious URL identified is https://maypoin.ru/wix?keyword=words+that+have+q+and+p+in+them, and another suspicious URL is https://cdn.sqhk.co/litigoruf/fVjht2g/sanile.pdf. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of a large number of external links strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=words+that+have+q+and+p+in+them PDF link annotation
    • https://cdn.sqhk.co/litigoruf/fVjht2g/sanile.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/fQanJjj/stickman_ice_hockey_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/zjdcx1a/red_ball_3_jump_for_love_kizi.pdfIn PDF document text
    • https://nukubutanedun.weebly.com/uploads/1/3/5/3/135309192/2399008.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/e74ee1fde84a1.pdfIn PDF document text
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/lekotibuxokotuv.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/1322057.pdfIn PDF document text
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/gesesudiluxejo.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/sutiwix_zuvagijukasezi.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/29ec934a7.pdfIn PDF document text
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/xabirasobawere-tedodavazudon.pdfIn PDF document text
    • https://jugijivarute.weebly.com/uploads/1/3/4/6/134620481/fewegasakipabij.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/7324775496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xalasawu/google_maps_real_time_traffic_information.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/17117761965.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/suzelumeseze.pdfIn PDF document text
    • http://juwijez.rf.gd/clark_forklift_cgc25_manual.pdfIn PDF document text
    • http://ravimerafewede.epizy.com/disney_candlelight_processional_sheet_music.pdfIn PDF document text
    • http://lufeneweb.epizy.com/padegigilem.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/informant_meaning_in_malayalam.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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 5364 bytes
SHA-256: 75e4f060358599af16fafd1a78e550bc28b45afb5c8afe75a51ae72408ecc012
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10732 bytes
SHA-256: 6e1be81fc860becf9491f8ff73a36eba4bb877c74804f176122c6e550cffb228

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