Malicious PDF — malware analysis report

Static analysis result for SHA-256 de79f7801b33b4ac…

MALICIOUS

PDF

56.7 KB Created: 2020-10-31 07:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 17612c27d73d94e29be6a5be62b035a2 SHA-1: 206ce467bcdb179f4aacaafe0ad0002304c2fa15 SHA-256: de79f7801b33b4acb9589169b07199ac8317aefe91e80426ee508a31cb62ae5c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of links to external websites, many of which are hosted on disposable domains and point to potentially malicious redirectors. The document body, though partially corrupted, contains a URL that appears to be a lure for 'new sat math formulas pdf', suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links further supports a malicious intent to drive traffic to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?keyword=new+sat+math+formulas+pdf In PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/0d0c523.pdfIn PDF document text
    • https://gagumosesixibo.weebly.com/uploads/1/3/4/0/134018544/telov_falatavaw_zixiveju.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/burolowe-zesogetot-vototowivezux-bizimexudolova.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/5fb10fafd.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/fetotuxuwimi-vokurakemusuter-simuwore.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/jilaj-gizejajasinux-musijiluleni-gataduvez.pdfIn PDF document text
    • https://durewisopugus.weebly.com/uploads/1/3/4/3/134369166/5280348.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/gupilogipupagip-joreku-juferagod-favovijodaf.pdfIn PDF document text
    • https://visajemilami.weebly.com/uploads/1/3/4/2/134265887/68f0f6d846a2d.pdfIn PDF document text
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/4825012.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/bda6262b80.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/tadovu/marajoboveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001a66f1-e422-4f25-9c6c-56f108d18569/aday_retmen_dosya_kapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7162273-96bd-4a91-9718-375ba18953bc/unit_1_resources_from_legend_to_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256ac2c2-7b2d-40b9-bfe1-50d5a20ba520/the_fifth_agreement_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb160744-6535-456a-9ebe-1ec9da77f894/rojegunapoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00eb96c8-73bd-46da-a6f8-20a78a87f0fc/zeruba.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_off00008e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E94 5068 bytes
SHA-256: 478c5a16c168c542ae5975494fe9c697e854d2b36b72113b937658166a688356
font_01_sfnt_off00009fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FEC 11652 bytes
SHA-256: 1185eb5feab8c85c9d1bececcdd8a71f1bbd7de0ffc1730d56bf7a15f5435396
font_02_sfnt_off0000c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3