Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d794908f6a5ccc7…

MALICIOUS

PDF

81.9 KB Created: 2021-03-06 22:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 66a4ca31d5bfb5b5de23f89c7ec9b123 SHA-1: 1b7b2fbe858ec09bde42541dd49f9eff23760e12 SHA-256: 7d794908f6a5ccc7479e5c6423f5bb35126b1a0ffe2b607866854d2134c4640c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/wix?keyword=nacirema+culture+essay PDF link annotation
    • http://vertigoa.online/zonudefilatudavareparesodh2d5.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/nidokusifajizakex.pdfIn PDF document text
    • https://ralugegab.weebly.com/uploads/1/3/4/8/134888835/9303530.pdfIn PDF document text
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/71fd0.pdfIn PDF document text
    • http://frut-tree.site/ipad_air_smart_connector_keyboard_caseu1z5v.pdfIn PDF document text
    • https://samojosaletope.weebly.com/uploads/1/3/4/0/134017273/nugojadog-fuderopasela.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/vadexevefavevu_mibotefisox.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/37462153629.pdfIn PDF document text
    • http://rekatilugo.iblogger.org/aluminum_composite_panel_sheet.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/jepugil.pdfIn PDF document text
    • https://pamiwawoxok.weebly.com/uploads/1/3/6/0/136089952/ab8098.pdfIn PDF document text
    • http://loxigedu.iblogger.org/analysing_english_sentences.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/gerozi_sefoze_zugazixi.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/mudedudum.pdfIn PDF document text
    • http://kdghy.online/avengers_age_of_ultron_comic_free_downloadp8b4f.pdfIn PDF document text
    • http://freshka.fun/jojetiditolajor359k.pdfIn PDF document text
    • http://titanof-filtr.ru/xiwaneronofevebazp4szk.pdfIn PDF document text
    • http://stickerrus.ru/xetezaderuxukiforuroxutizbklvw.pdfIn PDF document text
    • https://vofovolovun.weebly.com/uploads/1/3/1/4/131483423/zirovorig-vukidewov-gokipoda-rufaxak.pdfIn PDF document text
    • http://artrosil.xyz/girebobvk57y.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/622d82ee-d009-4089-b95f-d9db8e18e1df/practice_sat_writing_section.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52537254-1df9-4184-a29c-d712b4f813ad/ge_universal_remote_cl3_codes_for_element_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b411a873-9758-4e5c-bb7f-fba0c18a8c39/85050884856.pdfIn PDF document text
    • http://xelidamos.epizy.com/the_hershey_chase_experiment_worksheet.pdfIn PDF document text
    • http://nabukewegurizev.rf.gd/25528538616.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_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 4684 bytes
SHA-256: b93102e23c4160fabca6fab5283590ee357a0c4a940be4c638647d382da99903
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 10196 bytes
SHA-256: 16da66b7cf537d840081d5035c8971adbf7eac220386dd31b9d348b072e8c6f9
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361