Malicious PDF — malware analysis report

Static analysis result for SHA-256 703f532f660a2d0c…

MALICIOUS

PDF

89.7 KB Created: 2021-06-09 23:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 816bd8fc028d496d08781bb3fc74af93 SHA-1: c04eb3a50dad23a09c82ab8b7bb2bd143dae6216 SHA-256: 703f532f660a2d0c6e469bffec5aa3452a08000fc5b87417f5c4ddd3e5728e63
226 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. It uses a password-protected-archive lure. 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 0.9991

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/pbw?utm_term=mortal+kombat+x+alien+fatality PDF link annotation
    • https://dezegumi.weebly.com/uploads/1/3/4/1/134108828/taxegapuzopun_jamijelumeni_damekojedeb.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/593063.pdfIn PDF document text
    • https://zubirutis.weebly.com/uploads/1/3/4/6/134640120/jowotobiniresij.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/5d02e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puxivir.pbworks.com/f/dusk_till_dawn_piano_sheet_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2e1c3d-0eaf-4e35-8d72-7e60a13c4918/how_to_download_youtube_on_your_dish_hopper.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144421122/surah_al_fath_in_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05053a69-cf99-4130-8cc5-57086b78034f/67396035951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c153f9ec-bfb5-4985-88db-c68a20ad63f8/didit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f03acc-18d0-4b44-b0a0-5f96f6c98673/fufaximidosud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d5d6c3-23d1-4db1-a4aa-2445d6b8c0f5/869044979.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/how_to_breed_vapwhirl_in_monster_legends_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8bb1358-c026-43a0-af7e-39aca119cf5d/82486537516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559a4545-46de-43d5-bd84-4786a107d0fd/the_golden_song_season_3_ep_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b34dff-f0e8-432a-8c31-2b0b2d31e0b9/rifleman_dodd_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba941d8-1730-42f5-84eb-7eeb1a8ceb32/34528659855.pdfIn PDF document text
    • http://tulusozofel.pbworks.com/f/roworajijebofewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72475179-9850-49bc-a289-73c30afbe48e/ikea_white_wood_loft_bed_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadde897-2a20-4d43-bf93-5cac206544b4/need.for.speed.most.wanted2012_-_reloaded.rar_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22999689-61f1-4a11-b4df-507a69e41fbc/1917286165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5fb694-baed-4f1c-b000-9b6e7261e3c9/what_is_the_probability_formula_for_excel.pdfIn PDF document text
    • http://bolejagum.pbworks.com/w/file/fetch/144812328/88853036757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15ec43e-caa1-4c3a-a082-9ad1e5bf9b8e/mole_concept_multiple_choice_questions_and_answers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013fcd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13FCD 16684 bytes
SHA-256: 9af8661a465ea5d850b265e3fc552ce8594b53b374fafb4c7383c0a5a88bf0dd
font_00_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 5112 bytes
SHA-256: b652669d473c7e3b84e1be5a2a0d848237939f0e37b0b2eb43eef89550b3289a
font_01_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 14540 bytes
SHA-256: 3facc17ab2bd841120940a427c7b063ba539ad2c5c519f013bb784ab34369e18