Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1d72be0abb9e95…

MALICIOUS

PDF

117.2 KB Created: 2021-03-19 02:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38abb77f7c722c4a48718c1acf202fa7 SHA-1: 932e38ccd08683be7d77b2ea67107052e7659edd SHA-256: fc1d72be0abb9e95e271f199d8f1ee0036886907452bad2211bdacbc13e19d1d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL, 'https://nipisod.ru/123?utm_term=marriage+certificate+form+surat', suggests a phishing lure related to official documents. ClamAV and ML classifiers also flagged this PDF as malicious, indicating it likely serves as a dropper or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=marriage+certificate+form+surat
    • http://zikewexer.scienceontheweb.net/can_i_read_transliteration_of_quran.pdf
    • http://zikubuji.iblogger.org/anthony_burgess_a_clockwork_orange.pdf
    • http://sunukekubuwaraj.22web.org/captain_planet_full_movie.pdf
    • http://zodelem.mygamesonline.org/digital_asset_management_book.pdf
    • http://tipofeliluget.medianewsonline.com/can_you_track_priority_mail_international.pdf
    • http://lejunuzegakikuv.mypressonline.com/mattress_buying_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.indictrans.org
    • http://www.daltonmaag.com/
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_3fde770b7a1148af8271b9be97ec5664.pdf?index=true
    • https://s3.amazonaws.com/vufuzewasi/somumiminima.pdf
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_305afbaea0dc457f9c5af11d7e676388.pdf?index=true
    • https://s3.amazonaws.com/gowupuzokowuxes/proust_a_la_recherche_du_temps_perdu_english.pdf
    • https://s3.amazonaws.com/tixeligufokup/fire_sprinkler_inspection_report_form.pdf
    • http://vidokewokesun.rf.gd/wejonunuwovejojibupizo.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_91c34eda88dd410a9f1fa0f6c6481727.pdf?index=true
    • http://sogurorirerew.onlinewebshop.net/356357104.pdf
    • https://s3.amazonaws.com/bokelur/77456737002.pdf
    • http://lisunamubeso.epizy.com/5247048695.pdf
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_c8d4f82afc7a49a199dae660c92355e0.pdf?index=true
    • https://s3.amazonaws.com/xulepiwa/unreported_domestic_violence_statistics_2018.pdf
    • https://s3.amazonaws.com/dikobepibelun/33456850482.pdf
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_d9ae78f0eb8942c29692509cdcc65b02.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/1_2-dichloroethane_melting_and_boiling_point.pdf
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_39b3bf428a9d4775badf1782e505da82.pdf?index=true
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_e21d03a8f2d94496ae1d7dcf5cfdf8b8.pdf?index=true
    • https://s3.amazonaws.com/pulujolatepuv/58609699589.pdf
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_f3dcdba0dd084a21ba034aa28710f6fb.pdf?index=true
    • http://zarevarepi.epizy.com/11753231179.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cda.bin
cd0bae66b3357274663ce4f7c1043fe2b35df24b286723b1055caf3db1ed2a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDA 4948 bytes
font_01_sfnt_off00015dbd.bin
dec2b34100080190005657aa341c2b1fe59590c1a061af25d3e65f2c4df301cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBD 16956 bytes
font_02_sfnt_off0001933a.bin
64fa0a1eca4c1633d072d36d91ca5c0bbc3626e8f3ecd16275855d896b0729ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1933A 10848 bytes
font_03_sfnt_off0001b808.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B808 4324 bytes

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