Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6990508d3e0361…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 14:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 97a759716fb5f418bffe764f3a1975af SHA-1: 952b8ba165fcd860c5def1dc3906f92f0c39c7b6 SHA-256: ab6990508d3e036101ed50d5c05f67ecf4f04a575bf1abe83019321e311cb8f8
196 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 an SEO link farm, suggesting a phishing or malicious redirection scheme. The document body, though heavily obfuscated, contains text related to a 'November 2019 calendar malaysia template', which serves as a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics, along with the ML_NYX_PDF_MALICIOUS and ClamAV detections, strongly indicates malicious intent. The primary malicious URL identified is https://resalured.ru/123.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/123?utm_term=november+2019+calendar+malaysia+template PDF link annotation
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/savor.pdfIn PDF document text
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/8177990.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/6a3170623ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jevelel/2020_ford_mustang_gt_for_sale_los_angeles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7788b8-ae3c-4e90-b3a6-bf9cfc5d877b/how_do_you_move_a_scissor_lift.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/84376421417.pdfIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_f0a1c08b4e0d4ed8a7d46aff77580b40.pdf?index=trueIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_f54f2919372c45da943d843119257246.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/amazon_gift_card_code_generator_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/puletitirirosu.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/telugu_movies_2018_tamilrockers_kgf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afe667d-a385-4604-8812-aaae04d2723f/gatipoguxafiruparuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea450b6c-7095-4675-bb3f-52f217e62d70/hp_probook_6570b_ram_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d31b48f-576f-4628-a09c-84cccd67a132/damejeguvumowobak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fc9aa5-7e2e-4fe8-ae63-201d0f7a3d32/41158245259.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/free_punjabi_movie_ardaas_karan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8df8b26-979e-4f76-9786-152875b8f993/80020164947.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/as_ssd_benchmark_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 5760 bytes
SHA-256: 14705c1d561b5b09a0b41a093c8680010bb1aa2387925b95cf71fe1f4da205eb
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 10180 bytes
SHA-256: c0ebf8240b81cb4c434c96689f719b5f9dbdb6913debd671f5e7b280f8f18839
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f