Malicious PDF — malware analysis report

Static analysis result for SHA-256 1831a2bd6d09a70b…

MALICIOUS

PDF

84.7 KB Created: 2021-05-22 19:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3f662bb816905a477051f609921ecc4b SHA-1: 238d64ca99f21daf3cd99f068e73b71bd664bc08 SHA-256: 1831a2bd6d09a70bf82c40f6fdc4f47b6b1cbfbf853632f82df120bdd21784f9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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://golowaki.ru/strik?utm_term=can+i+take+my+drivers+test+during+covid+19 PDF link annotation
    • https://torusakewojowep.weebly.com/uploads/1/3/0/8/130814967/kenamasitedisu.pdfIn PDF document text
    • https://kodetowunim.weebly.com/uploads/1/3/4/7/134701578/4292833.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/tuwuseja.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/9b1f0b8a-633e-443d-aa4d-de397e77809c/how_long_is_pretty_little_liars_season_7_episode_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0703c8fd-a6b6-4055-a9ab-d658ff25d658/how_to_create_a_local_area_network_in_windows_10_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5068d35d-cbe3-4fd3-89a2-b91c7ec9a02a/texas_instruments_ba_ii_plus_professional_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc04dab5-782d-4ec9-8f9f-f343131c29bd/ejercicios_con_verbos_ar_er_ir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c481fa-d557-4fe7-8e25-c1d6f374cb37/57230167107.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/7630104873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b79a9aa-11b7-4cf1-a033-bdbc63d53a87/baby_girl_names_starting_with_s_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3f8856-3b33-4c3a-b67b-d3ba23099bee/the_alchemy_of_finance_by_george_soros_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89ae094-f8f7-418b-9f2d-b87cfea76eb5/89635279599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a077ff-e0ab-4d68-91bd-c68a21da3d26/pajup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791b5fd7-b55b-4206-b34b-160122afeb59/smoothie_recipes_with_almond_milk_and_spinach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f01a4a9-c7ea-4ab0-94c9-ade6a2f8e6db/sojurujudajobijepejizevos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1aaace5-c933-4e8b-9307-2a3c00b5c44d/lb_per_ft3_to_kg_per_m3.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/basixemuxavidovorig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238fb582-54c0-4e5a-bd1e-516ba671b746/nupewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a143907-fb25-410e-a8b9-d9671ef57d5e/vumelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c743ff-633b-407d-ad14-a7a914c126c3/gidexisen.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 5564 bytes
SHA-256: ddfe9233a079948570ce1bd192b6c4cb0970a7d154e93764e34ecace1f69ff2d
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 14792 bytes
SHA-256: d92903765df2b185618c589f84a83dfdf57585994ff147d73aa61e0c0016b1aa
font_02_sfnt_off00012ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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