Malicious PDF — malware analysis report

Static analysis result for SHA-256 819c32f3ea74364d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 14:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c0d0f4b3f4001ea0a16a9d7fd1c83c80 SHA-1: a64d98c3ca9928bf489183176cdb5f3e272f534c SHA-256: 819c32f3ea74364d8c2f39c521b0bf3f5e9a6edc6cd4b7dc1c272c47b66ef5ba
186 Risk Score

Malware Insights

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

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 0.9960

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=budget+highlights+2020+18+pdf PDF link annotation
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/27a48f91.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/0ad138019.pdfIn PDF document text
    • https://givunanisu.weebly.com/uploads/1/3/4/8/134848628/zasorupe.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/noun_pronoun_adjective_adverb.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/gugurixabowemija.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/ms_access_database_tutorial_for_beginners_step_by_step.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/zafixorijadexodoxov.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/vobupefijov-xemevevupode-faritu-xadanaguvulini.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/is_arris_compatible_with_spectrum.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/9900c03c889f4a6.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/17606567113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/bad_boy_lyrics_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f512a6-5d5a-4b44-889e-026698d1da7d/what_is_a_scouts.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_6dd275ac1d974102a8d1338ed18cba7f.pdf?index=trueIn PDF document text
    • http://boxijekew.atwebpages.com/33301662596.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_b75839082c69498fb17fa51c133e3d2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dce3dbd-dba5-4fde-87a5-3fc80d7ffd21/le_petit_prince_chapitre_13_analyse.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_0d5c3f0cbcfb4c37a7975cca08bce300.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/53119945768.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_bc3930fdd8844f598c443cefc8d41d43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e569db7-d308-4193-897f-79ff2bcfde66/67892670310.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/cloud_atlas_sheet_music.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_3295bbb3e9a34d238d2bfb89ab3c1087.pdf?index=trueIn PDF document text
    • http://nupuzawov.onlinewebshop.net/calories_el_pollo_loco_tostada_salad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63835a1-f2cd-4120-b95b-3b36b38587e6/rugiwerimujulatowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10738521-726f-4d41-8d04-5895436b9302/how_to_update_my_ti-84_plus_silver_edition_calculator.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_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 5564 bytes
SHA-256: 9213fac5d341f7f61f262ea34fe24f1627059ae7338b5ac0d29bf01bd75513e2
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 10312 bytes
SHA-256: 89f8656143a082004e9cc431db01424e616e7e20537f818e17d21fa889f34e90