Malicious PDF — malware analysis report

Static analysis result for SHA-256 153877deab779a41…

MALICIOUS

PDF

75.6 KB Created: 2021-03-30 20:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 529f099d0039d2dfff9b6decbccc8a7c SHA-1: 661977f86a34ebed41b58cbda82efdcb8ad3d23e SHA-256: 153877deab779a411b9c973b831b101be946ad134a034e8e5c17b38079c5c6dc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to a 'Delhi metro map', likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=delhi+metro+map+pdf+pink+line PDF link annotation
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/5571da.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/naxikeligaziku.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/4521010.pdfIn PDF document text
    • http://aarbuz.space/golds_gym_xrs_50_exercise_guideqx10r.pdfIn PDF document text
    • http://upsbox.ru/muvegegebilifiwc3uis.pdfIn PDF document text
    • https://migomazi.weebly.com/uploads/1/3/1/4/131407029/8d2fed5.pdfIn PDF document text
    • https://lotitarep.weebly.com/uploads/1/3/1/3/131383228/82ed8f7ab653fe.pdfIn PDF document text
    • http://cz-nitrof.website/dowefefivodipibebawowaxi40s4f.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/7367242.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/satagenipa_wenew_lalixuwumed.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/lasalunuvuganazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_e257535c02c1479cad61fcbb4e6ca196.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f464ea5-4d75-4372-8971-4ff7282a0faa/canon_mx430_driver_download_windows_7.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_6c9971ae73a541db8640845b533b1d9c.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_fd9027c187594874aac91319fc6784dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e21497-a2ca-4134-97f5-3d8096195c22/71441596870.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_8a987797bb3c44e19ab9b41d92ece17a.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_8a3471c72f0b4f0db6cdd20bcef9d9a0.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_cf5b4399315b48a88a3a76d3fd9ff702.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5627e3-700a-44d9-b191-5bdefcd5756d/surface_area_volume_of_composite_figures_worksheet.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_dbc0bc3229ec4b6fa0b0f06fc612f699.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_8b60e77bdbd642b6874a1793f7c0e29e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ab3250-d808-4394-a4f2-4380ed061fc8/gadoxi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 5164 bytes
SHA-256: 53ee18fd371ee182c618149f98dc5a67d9033132d82112c205593205af2f4de4
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10556 bytes
SHA-256: 30e9316beea1b96da83805d387e6c462b5689e939478494055d769ff67591afe

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