Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b917b49aa66d82f…

MALICIOUS

PDF

76.8 KB Created: 2021-03-20 10:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 559e4fbacfea9d0e5378476282f9f8cc SHA-1: 5c97aa701713b892ea0b0c72f16c340ad030a871 SHA-256: 5b917b49aa66d82fe6ab48e982fdc4a460a447d019e17c2e14fd941a78515326
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, likely for SEO manipulation or to host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://fokemale.ru/wix?keyword=the+united+states+constitution+divides+governmental+power+to+prevent PDF link annotation
    • https://cdn.sqhk.co/panosiritu/RXMZww8/marco_s_pizza_bowl_net_carbs.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/58621423346.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/jdSoKif/tixedamugiwuwigibadujoxif.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/nulimapojoneref_niwiguzafu.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/2a1f5777324.pdfIn PDF document text
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/8225721.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/2gi2sja/82930375306.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/das_wunder_von_bern_tor.pdfIn PDF document text
    • https://naviguxiva.weebly.com/uploads/1/3/4/2/134266723/3f66a33a45f.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/Cjjghjd/gajomesototimavirise.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/a81289efd0aae.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/zidutug.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/K6jcKUW/61613986284.pdfIn PDF document text
    • https://xefulexemifin.weebly.com/uploads/1/3/1/3/131398452/042a7a2cf4a25f.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/dHjikih/mini_golf_near_montrose.pdfIn PDF document text
    • http://finonit.mypressonline.com/nuzalaxisarogisori.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/Zgjmhg0/numimenovakibotojaxov.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/mefadedosuw/android_tv_app_store_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/30565601955.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/2910871456.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/68735353096.pdfIn PDF document text
    • http://vulopekusape.atwebpages.com/modern_analytical_techniques_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/does_nike_donate_money.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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 5468 bytes
SHA-256: eb6fe89e7df0be0840bc6a15503574adb281f6fef09b07c19a9d77177e068a4a
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10160 bytes
SHA-256: d4c9c543100d8d28c279a3bbc21686dd791131d3e70de1609a75695464072494
font_02_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f