Malicious PDF — malware analysis report

Static analysis result for SHA-256 307c8bcbd5d648f7…

MALICIOUS

PDF

78.0 KB Created: 2021-03-11 19:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 12c73f2a428f61d54addc49d74803d28 SHA-1: 4e8f108abff9d608d68b10230602e2b6578c8d4c SHA-256: 307c8bcbd5d648f72e184be175e13023fb00aa35f45be7e2f54f3c1036e3c068
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on various platforms. The primary URL, 'https://lozipotod.ru/award?keyword=melhoramento+gen%25C3%25A9tico+pdf', suggests a potential SEO manipulation or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=melhoramento+gen%25C3%25A9tico+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380080/normal_6031072dea0c9.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/ghhicgf/tipepuxuzusupufiwubejex.pdfIn PDF document text
    • https://cdn.sqhk.co/zujomawa/jUWswBF/nigomadigisigediv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5ff587e78abfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_603ead50d850d.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvavegipap/d3gfBEY/fox_sports_radio_en_espanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_60482e5e01e22.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/ydLsgi4/american_metals_market_scrap_prices.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_46d244499c504e299de452b21e976710.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36c1b97-7024-42a5-8a18-785e6e42e55c/selama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5759f16-34f6-48ae-b9dc-adb37bca5497/wemunumaxal.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_e5858829bca74a2a8eedeb128bd08471.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_4a1217c43c3c4a108685387599d02beb.pdf?index=trueIn PDF document text
    • http://fesavuvab.epizy.com/85542748155.pdfIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_7e0a1778ee0d4cad808ee5588af3de5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d8360c-4e55-4afc-a5a1-521f25c3b20e/how_to_gain_weight_food_schedule.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_2c520907007c47e59521877688a55113.pdf?index=trueIn PDF document text
    • http://zivobojunoloma.epizy.com/mulelaviwupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb67cc4a-35f2-4c58-8134-6e92c8bd65d5/tales_from_the_loop_review_imdb.pdfIn PDF document text
    • http://wiwekunu.rf.gd/wedevalefujinupefiwuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb81fc8d-0811-49cd-8749-a292d0dd8527/xedeguwesovano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdf9ef6-db2e-4688-b160-375714d6ddb9/what_kind_of_sim_card_does_the_galaxy_s5_use.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_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 5536 bytes
SHA-256: f6a682600b0473d1c76dc50c2df18a4a728dfe34684c754a636b772d4e238e82
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 12476 bytes
SHA-256: dc5479a83e9ae86e4cd007624fbe2ad798de3ff6da88de4ed50308c7497c2087