Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95e0b319b349ebb…

MALICIOUS

PDF

76.2 KB Created: 2021-04-25 10:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 475d18ba3d4a672c2a370d509c8f7041 SHA-1: 5faa31aac7e5bcb7fc93e1e639a1aac5317919f7 SHA-256: a95e0b319b349ebb46dc2b833e17c6021b0153f0551d4e0d0911180e85576766
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, characteristic of a link farm, with several pointing to disposable hosting services. The document body, though partially obfuscated, suggests a lure related to 'middle class values' to direct users to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=what+are+three+values+associated+with+the+middle+class PDF link annotation
    • https://jojijuwewit.weebly.com/uploads/1/3/6/0/136057333/togus.pdfIn PDF document text
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/difugatilidugoravu.pdfIn PDF document text
    • https://wanojotuza.weebly.com/uploads/1/3/5/3/135346096/264d6c.pdfIn PDF document text
    • https://zefakibafiv.weebly.com/uploads/1/3/1/3/131383453/kikefi-parani.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/4207980.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/cahfihX/5675852849.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/fHpdhaz/luvoka.pdfIn PDF document text
    • https://fedofiri.weebly.com/uploads/1/3/2/6/132681193/79351f6.pdfIn PDF document text
    • https://dosevabif.weebly.com/uploads/1/3/1/6/131637409/ea13004a66f3c2.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/Hhgidje/kasavufavegiba.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/4hdB800/66733110259.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/hchfYwS/most_popular_tiktok_songs_november_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/jiiJjcR/outlook_desktop_calendar_not_syncing_with_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/gjKSkVf/five_nights_at_freddy_s_2_scratch_unblocked.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/08d35ce8-dc24-4af1-be0e-004c6ca4423f/76215220910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccbdc97-4e1f-4942-a3b7-93fa3b002b7e/66114014350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16e0b25-0b47-4e17-ba0b-4114cf7ff7a1/what_is_a_literature_review_example_for_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1488aaee-4da9-4e28-85f6-793a48d3699a/wajogezediterar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1363a37-193d-4490-bd64-00e4b8f66ea9/techniques_for_teaching_listening_and_speaking_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9338904-ead6-41b8-a018-f41fa971247e/swing_trading_for_dummies_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7339466b-a87e-497e-befb-ebe59a2c2c68/verbos_irregulares_em_ingles_mais_usados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9bf6ac-87d3-49d9-b378-350c1e93df23/combining_like_terms_algebra_khan_academy.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_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 5344 bytes
SHA-256: 3d7636f48815ae07dd3ce1c02ed1779d6eb0f5d73becf385b52179112e1f308f
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10740 bytes
SHA-256: 9487bade247950014f39818cccb2a77914a5a1d31b4567eef0825da250e705c2