Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03124af590af46f…

MALICIOUS

PDF

79.5 KB Created: 2021-05-24 01:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5e6fac497d9864bba2ff147645ecbbfd SHA-1: 1087a55edd05efe396e14af535091b9fec1bef24 SHA-256: c03124af590af46f54c57fa26832e9e3d244fe39269dc84079b2d0b4f771ca5b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, including a prominent one to 'xajibur.ru', disguised under the pretext of providing information on writing a compassionate leave letter. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://xajibur.ru/strik?utm_term=how+to+write+compassionate+leave+letter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409255/normal_601715c08d7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490547/normal_602c058e3baef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_6010ff73724c0.pdfIn PDF document text
    • https://tukusalo.weebly.com/uploads/1/3/0/9/130969921/2335996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5fd34d4d0d3d2.pdfIn PDF document text
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/ec3ca104fec98df.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://s3.amazonaws.com/baposivarabuj/1384524780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff2fb35-a0db-4e20-856b-83236c3bc58c/fogejeludin.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/the_scarlet_pimpernel_short_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a61d28e-5379-47ad-8109-3bdc59632ffa/sitijadox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac3452e-aa5d-4d73-8792-3656fd6b51d3/do_short_haired_dogs_have_an_undercoat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236a957a-e85c-4dd4-a326-6be50cd266f7/integral_cos__2x_sin_x_dx_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff2d22a-f4dc-48ca-a0dd-94532b048368/how_do_i_improve_my_intuition.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/dikifasimifipulewad.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/60570542061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe6115a-703d-42de-9acd-74ee51c1c199/sixteen_basic_ukulele_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/chicken_invaders_3_multiplayer_version.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/how_to_change_batteries_in_kwikset_smartcode_916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765d3fb7-2dd4-437b-a9ab-58c59d6bfcb1/74824975086.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/dimensional_analysis_problems_with_answers_nursing.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_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 4980 bytes
SHA-256: e46dbcfdfc274b503bcc5135b4dff5215bf36729a75deb60b1a00442dd2fc3ec
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 10496 bytes
SHA-256: 66b5a6dc1a97eb6dde9900f34ee6a998afa2dcf87ff6ca5650fc8381345d0f79
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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