Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37e1ed68d16bb6a…

MALICIOUS

PDF

83.4 KB Created: 2021-03-26 09:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1fe4184569c9279762168248d025c33d SHA-1: d7123fece8252290b226a34c860326d603632760 SHA-256: f37e1ed68d16bb6a24cb7493ba1afa36fc2518a5985d5bb49ea13ac826b3d042
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=apeman+camera+app+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455658/normal_604b31b2aec29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_605d871cd2a09.pdfIn PDF document text
    • http://carishr.com/carmen_sandiego_theme_song_sheet_musicu9pwd.pdfIn PDF document text
    • https://perutibabejodu.weebly.com/uploads/1/3/6/0/136051808/feritare-zosod.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/printable_self_esteem_quiz_for_adultsgpgpj.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/wuwupikelogixazekoxefigqyfwg.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/antagonistas_de_leucotrienos.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/cisco_certification_roadmap.pdfIn PDF document text
    • https://zifusiwi.weebly.com/uploads/1/3/4/6/134686012/5801761.pdfIn PDF document text
    • https://lakubamovoto.weebly.com/uploads/1/3/0/7/130776542/bagokox-fitawexuzapa-bibedenegi-sokizibemowam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_603085dc20865.pdfIn PDF document text
    • http://afterdealer.pro/67804854543id8f5.pdfIn PDF document text
    • http://moscow-siberian-force.online/how_to_do_a_hard_reset_on_a_rca_voyager_tabletchut0.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/afb3cce2-8ebe-41d1-bee7-4faed2ce63a9/how_to_solve_cube_in_20_steps.pdfIn PDF document text
    • http://lexamokoxerum.atwebpages.com/tigeravodel.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_6c456fc969e14b2e80868a6ffe66e54d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ba5815-43a7-4516-83e7-7575ff453dfe/how_to_merge_files_with_foxit_reader.pdfIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_3b0d9150f49a420ab5e12a67e38c2e8e.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_fb3d3e32bcda4bab8123a3bde3247e50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9300ec0f-830f-49c5-a9fb-ccea0b42e75c/pizixukibakitisekuguze.pdfIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_c21404a71cd74cb59200f4c9dc6312db.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 5000 bytes
SHA-256: d579edfc803db3a4250a2cccf534db6baf902b97ce0a76643dbe8708e4644d91
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 11428 bytes
SHA-256: 78f8e5c40e288d957e61c543cc22ddf7b8edfbe9cc41dbeed140eb53095e8eba
font_03_sfnt_off000129d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36