Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5e66d32c4b7099…

MALICIOUS

PDF

81.0 KB Created: 2021-03-10 23:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a1d8eb81e7f8f3f944d67224dbb0bc63 SHA-1: b2010ca20562aa6941e0aac07b8823d2a82c34f0 SHA-256: ae5e66d32c4b709962388188700a1582e1b851b2e87a92bfc8f8afa0c766037a
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phish users. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious redirection or payload delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/123?utm_term=switch+emulator+project+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381762/normal_603e0cf0cd81c.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/what_are_some_examples_of_specialized_modifications.pdfIn PDF document text
    • https://winulovovitazu.weebly.com/uploads/1/3/0/7/130740324/5a86f992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5fd3511c1c5b0.pdfIn PDF document text
    • https://boraweterepin.weebly.com/uploads/1/3/4/8/134864111/patatexi_reriduxevowazej.pdfIn PDF document text
    • https://benanuvez.weebly.com/uploads/1/3/0/8/130813453/gukemotorasuxu.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/petsafe_wireless_collar_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/hdLGNtw/colors_that_go_with_red_brick_house.pdfIn PDF document text
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/ee6e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5ffca448e59cc.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/5269c512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_60020caaefc93.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/5a8a78cc14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_603956a32b8d1.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/digAVii/dragon_quest_heroes_switch_gameplay.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/how_to_remove_drawer_from_whirlpool_duet_washing_machine.pdfIn PDF document text
    • https://pazonijozofax.weebly.com/uploads/1/3/1/6/131606668/d20a01cd63017.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/windows_sbs_2011_support_end_date.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/f451cf815873e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/af308d6a-a340-4654-be74-e7bdfe7d04ba/61596567051.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/jolumotiriris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9f1021-b7e6-468f-b15c-c54c93629652/nudokinomofus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 5108 bytes
SHA-256: d2235089dd29ea4b5a65cc5b6e3520a9fcbb52dbcb5795e54e014ca9800c514c
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 12076 bytes
SHA-256: 62b3994869fdf596331991fd5bde60e46dfab36c529b514788e1a5382728045f
font_02_sfnt_off00012897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f