Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d025938f463783…

MALICIOUS

PDF

77.2 KB Created: 2021-06-09 10:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 15acfbd3433ccaf421b49ce30ab51fba SHA-1: 0f8ab5d1d9b860186e73733a2dfe314ee813f78c SHA-256: f4d025938f4637836a952b012ad6077ad1594ee402ba2d4006fabea7e9d8e24b
202 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO poisoning or phishing. The document body, though heavily obfuscated, contains references to 'download' and 'effects pack', aligning with the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The presence of embedded URLs and the overall structure strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/pbw?utm_term=wondershare+filmora+effects+pack+download PDF link annotation
    • https://misoxuvisobi.weebly.com/uploads/1/3/4/6/134673897/wezizabak_dibemalana.pdfIn PDF document text
    • https://getikegujobipi.weebly.com/uploads/1/3/4/7/134744553/5c30ca8e0f5a.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/3763669.pdfIn PDF document text
    • https://ragenakesigufu.weebly.com/uploads/1/3/2/7/132740294/zivinulonigomozegez.pdfIn PDF document text
    • https://gebifafotuzuwi.weebly.com/uploads/1/3/5/3/135324040/wepasiwali.pdfIn PDF document text
    • https://ruxamaref.weebly.com/uploads/1/3/4/7/134749336/varake.pdfIn PDF document text
    • https://nenimokevip.weebly.com/uploads/1/3/4/3/134336374/tazimiza_lupivile_bifutowuvenul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74d9094-f038-461c-af8c-7a493db0cc7e/nasty_gal_promo_code_january_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89b59fa-fc96-4ebc-92be-c5d3b64e8662/9085814939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2058144-d287-41da-8c73-14766f8ac52d/zoroje.pdfIn PDF document text
    • http://pexovobef.pbworks.com/w/file/fetch/144672525/interstellar_movie_hindi_dubbed_download_filmyzilla.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/where_are_cub_cadet_zero_turn_mowers_manufactured.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce1470b-75fe-4d8d-8e86-bc2eb223d410/numopumosukubosiritenujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fbe3a7-4cf3-4a6a-a93c-22a597172f9d/renizisibizesilosakonag.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144411867/tagowovomitetizi.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/ielts_general_reading_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37d4c39-4a60-43a6-839f-7b6910f1050f/81513475596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddae112-3153-4335-9ce5-774b98ba2e9e/heart_of_darkness_joseph_conrad_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1b6c1d-fa25-4b67-98cd-9dd68688db94/what_star_sign_is_the_21st_december.pdfIn PDF document text
    • http://kugiwetod.pbworks.com/f/introduction_to_algorithms_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c2eb81-dd2b-4609-be8a-1372a7e6ad92/como_descobrir_a_senha_do_wifi_no_android.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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 5564 bytes
SHA-256: 0037f7fbfe11215aac3d9184717481aed071ac6546fb73ce40196919a7fb6dd9
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10652 bytes
SHA-256: 9e585611f06f06303b4da0ba3ef4569a6fe069e9c076152e6b02c600b24f5a3d