Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cf87c3d35884cd…

MALICIOUS

PDF

82.0 KB Created: 2021-03-22 01:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 96169d718cd68d84e0f0e8376270fb62 SHA-1: 231e1af5c6930da2c1e8d3da84926b2287aaf1cd SHA-256: 15cf87c3d35884cdcc83d14bbd4b670a18005b6f44c72987ec8953c9a9093e21
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One of the embedded URLs, 'https://golowaki.ru/123?utm_term=types+of+sentences+exercises+with+answers', is presented as content related to sentence exercises, likely a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=types+of+sentences+exercises+with+answers PDF link annotation
    • http://hopecommunitynaz.com/before_the_rains_movie_dual_audio4sf68.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/rotigitolo-munil.pdfIn PDF document text
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/9917140.pdfIn PDF document text
    • https://sumukekunazub.weebly.com/uploads/1/3/5/4/135400219/ninavemufo.pdfIn PDF document text
    • http://pet-guru.shop/241650200593hztw.pdfIn PDF document text
    • http://boost-store.net/ufc_results_yesterdaya49en.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/rodajijukadagidaboj.pdfIn PDF document text
    • http://axecheat5.xyz/aliexpress_coupon_codeguod6.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/5246145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_d8db8e084d224d5a91baa449bbe0abb2.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_95a6b4ebbd69496c99e30ea70efc8ec2.pdf?index=trueIn PDF document text
    • https://63150c49-9e7f-4923-bc7a-1e4049050ce6.filesusr.com/ugd/cba449_5ef8353d5353472d80af7a66000fcb9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b36252-f2ed-4ee8-a26f-b7852d00b84f/how_to_remove_coffee_stains_from_carafe.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_21519077daff4d21bfcfeaec36b2890a.pdf?index=trueIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_8c65da7127e942eda016f4adf151afdb.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_7f3f998c1357495b8c485d13c1623953.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_2110094cdfc648098395e8a03882354b.pdf?index=trueIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_3f3022a2e05b4b699a10405e5d9430e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d908592d-6baa-4ff5-8dc8-16a1d0771648/wonder_palacio_amazon.pdfIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_2277c518c8854992901376a99f98f858.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://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_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 5284 bytes
SHA-256: 07456b3b003c6370f856f7d33408eaddc90a0c55ae8463e1c747dd601d6b407c
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10764 bytes
SHA-256: 0ccca86b8ed2c445a74da0a38002365238a9014839d584c9c2237f866f892711
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 16424 bytes
SHA-256: f9711cef3ffb559c81ad9745ecc8fbef96de05f5d4c87c1b3b658693177715a7

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