Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d95d6524f19cc36…

MALICIOUS

PDF

67.6 KB Created: 2021-01-29 16:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5247d25ea1302095fa015d8e2a977348 SHA-1: bf78fa739865858dcb605e29592b3fb060027311 SHA-256: 2d95d6524f19cc366da2a641685cb81e8e38e3e11f7cbaed2e2190f32b468c34
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL directs to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics further suggest the document's purpose is to artificially inflate search engine rankings or distribute traffic to a network of sites. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wb?keyword=ikea%20dresser%20hacks%20pinterest In PDF document text
    • https://fivarebaxuru.weebly.com/uploads/1/3/5/3/135326201/vinagima-fanifegekovefu-sewufefuwebuw.pdfIn PDF document text
    • http://zinekob.66ghz.com/image_of_nature_tinyjuke.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/gsHhahc/80701086108.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/18701758910.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/9zBihJn/cannondale_xl_frame_size_in_cm.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/j2hfZsb/droid_depot_personality_chips_types.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/xubejeg.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/gOjjSB3/61239933125.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/hjgehfM/warfare_incorporated_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/iBQjiXa/wedixatatorelemevemuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riporem.epizy.com/22621046756.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/national_lottery_scan_app.pdfIn PDF document text
    • http://wikidupuzok.epizy.com/darkest_dungeon_guide_book.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/64046157696.pdfIn PDF document text
    • http://ribaxekag.epizy.com/angular_formcontrol_select_options.pdfIn PDF document text
    • http://zuvetimimu.rf.gd/masonry_wall_design_guide.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/long_term_causes_of_ww1.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_off0000cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 5132 bytes
SHA-256: 7de2d914236bbe9fcc4d4e97051d050563d8136c00ff73456c5b0f8a25cb4b71
font_01_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 10932 bytes
SHA-256: 79c5c926afd96b9b50cc0899c6a4c7b045618b65521a0a8e76f379faf8d01be0

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