Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1ab5953eb4dafe…

MALICIOUS

PDF

90.9 KB Created: 2021-03-06 06:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 873398f8396054ba39f4e9ffc0b00905 SHA-1: f6bdbfa92e07da402d829ade129ff030ab92f887 SHA-256: ce1ab5953eb4dafef07e7ee45e36742fe2b6243f0cfbc3316e1ecb9490b27126
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to suspicious domains like 'baarspo.ru' and 'cdn.sqhk.co'. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=is+tom+clancy+the+division+a+single+player+game PDF link annotation
    • https://cdn.sqhk.co/konumapedowe/XisianK/47409491535.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/ycjcPic/extra_equipaje_canada.pdfIn PDF document text
    • http://rat-red.space/articulos_de_la_constitucion_mexicana_que_hablen_del_medio_ambienteu2wzj.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/T6h4Kp1/pamikob.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/SO4GghH/flights_to_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/hgjBijn/visedotigo.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/FOhbgh3/zotawudefumotaboboge.pdfIn PDF document text
    • http://fredo.run/92064597447m9ijs.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/vawoginele/kulosijasiwolonemedamif.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/rofedufabigorejes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35330ce7-4afa-4bed-a6bf-ee0f2972c276/lewozuwulexavizoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ab4f37-ae52-47e4-860f-dd288dd8c406/what_is_an_environmental_portrait.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_497998d44e714f3185a33dc370250386.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ab04a8-c3df-447e-9e8d-495b640a1f65/toyota_camry_hybrid_price_in_kerala.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_df3c3d091cf347958ba047066d82af73.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 5588 bytes
SHA-256: 817af02aa8d1e05b1e5ba3ffe2b299901daa1ff380db2fb278ceaec701e13474
font_01_sfnt_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 10904 bytes
SHA-256: eed1a72721330ff6c1b7ada7b1d31d8991b0b75d58db7ed9e599d9aa3b645c95

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