Malicious PDF — malware analysis report

Static analysis result for SHA-256 437fbec3502f5b8e…

MALICIOUS

PDF

109.6 KB Created: 2021-03-10 20:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 137554bf0af2f673c5e62dae57a7cbd0 SHA-1: 4f31c25b68b8dc634332adcddfb105775e2d34fe SHA-256: 437fbec3502f5b8ef0b0e690f88c57de7b6579f65a6d99d58a9a06d75fd7eccb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/strik?utm_term=learn+arabic+alphabet+with+tajweed PDF link annotation
    • http://terugate.mypressonline.com/jofepukado.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/jbzox54/classical_piano_background_music_download.pdfIn PDF document text
    • http://rogevunesopu.medianewsonline.com/87970052919.pdfIn PDF document text
    • https://cdn.sqhk.co/rawegili/jjdhdig/collocations_make_and_do_worksheets.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/briggs_and_stratton_service_and_repair_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/i9dIhBp/meeting_guidelines_scotland.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/vthj5gh/62844121842.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/gWZ3he3/86254342524.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/71624864451.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/eVigxh8/chores_meaning_in_gujarati.pdfIn PDF document text
    • https://cdn.sqhk.co/sapugelezuf/djhuZsm/7767369243.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/wurivuve/pujenemuromadogopujimefov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f08420-a3cc-4189-871a-1e5616a51998/bunuremamugixewonajoxamev.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/the_wahls_protocol_book.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_983a89d02f034c72b5a3046c03d4292e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/new_malayalam_movie_aanandam.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_30590fca54f641b7b58703e62aad3906.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/najenaketabelagofodixa.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/scary_stories_to_tell_in_the_dark_2019_full_movie_hd.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_53fb3f207a30423a96ff125e030ca4fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc48798-92e5-4cec-9b94-ffaf7050606a/30682874377.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_3f528ea5b9ba49aa88dc8919553080cd.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016b0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16B0E 35576 bytes
SHA-256: 920198e7809cef05abcc3b27d905ee8de3c8fa7483f3448f874d015dd48d58c3
font_00_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 5232 bytes
SHA-256: 5bbf68e14197951f4511ecf244f81f1e60841505ac78026e55579405df8a1467
font_01_sfnt_off00014481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14481 11876 bytes
SHA-256: 8dd780e617f58eb556998c0e567f097195b720284dd22aef420c7edf07c4b05a

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