Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b76593db22ea88…

MALICIOUS

PDF

79.8 KB Created: 2021-03-19 20:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e266a177bc81eb6deb0aeceb47380adb SHA-1: dd971a20a51095f08b998c0f1e72f7a5b5aac96c SHA-256: b3b76593db22ea88a060c81986c3c4e63f53d8e65c30b08793487e690d68a0b9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of such domains for SEO-related purposes, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://maypoin.ru/award?keyword=accord+adjectif+de+couleur+exercice+pdf PDF link annotation
    • http://tuvivukaroj.mygamesonline.org/how_often_does_usps_find_lost_packages.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/42124158990.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/jic1zib/seledug.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/history_of_alternative_dispute_resolution_in_nigeria.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/2010_dodge_journey_sxt_repair_manual.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/lords_of_chaos_movie_soundtrack.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/21051089913.pdfIn PDF document text
    • http://bujenaro.scienceontheweb.net/kobomefexolawaragilavi.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/giChcje/unity_ragdoll_bullet.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/81421991265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/jizawezubuxixemuzigudeba.pdfIn PDF document text
    • http://ximuxulizi.myartsonline.com/woliwizopus.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/29377308090.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_75fe3c3644f44883a2b1b7adf8fb772a.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_f6702fb76a784611a48e33ebab1c8027.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_74dad5680fb24faaae0bf29fe7959f3b.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_901f2e2d65a34b278fd4706f307bb28c.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_65a40aac8fe0472aaebc00522f48cd1f.pdf?index=trueIn PDF document text
    • http://jimarol.myartsonline.com/kali_linux_for_raspberry_pi_2.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_fb25475278f749b4b115a168ae340997.pdf?index=trueIn PDF document text
    • http://vujapoguxesak.myartsonline.com/sports_illustrated_release_dates_2020.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_e217a4187f814a6c91c720623c25b266.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_bad03a56789c47149b38c84cf5f2ccb9.pdf?index=trueIn PDF document text
    • http://toxifiv.myartsonline.com/exercise_after_knee_replacement.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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 5104 bytes
SHA-256: c00021e14f31569313e4b56d800486156d34835b271f4273d28018a264ab3cbb
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 1680 bytes
SHA-256: debaf3ff37cadd88e03f56a1da1b20b0676acbb0c2dfc7de7569b922f44b7b54
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 12248 bytes
SHA-256: beb6b622f6ece4dbfd59603e00f021d81208c71eba28e7fbd1a461191aa7e296