Malicious PDF — malware analysis report

Static analysis result for SHA-256 784a1929442c45f7…

MALICIOUS

PDF

78.3 KB Created: 2021-04-22 13:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36448ccac81ee254ce35ff93ba708696 SHA-1: 2f42b1859865466ebc149d9fb4e86ca1f5e9531c SHA-256: 784a1929442c45f7bab9962babb368b2e0cc4ba6b59cd186f05043e2bfcd850d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The embedded URLs point to various domains, including 'gimoguvi.ru' and 'sqhk.co', which are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=duraflame+electric+fireplace+insert+lowes
    • https://cdn.sqhk.co/zapajugadira/dgctOEh/52805818126.pdf
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/kimugomifegize-pitowaf.pdf
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5ffa6df86d7fb.pdf
    • https://fawofasoz.weebly.com/uploads/1/3/1/4/131454040/kepuvevagemefo.pdf
    • https://cdn-cms.f-static.net/uploads/4420431/normal_6058fd1a974e5.pdf
    • https://cdn-cms.f-static.net/uploads/4407777/normal_601dc35b5dd46.pdf
    • https://cdn.sqhk.co/noruwotil/isji5v0/dave_tv_program_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5ff442bfc78d2.pdf
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fc5acfcb7828.pdf
    • https://cdn-cms.f-static.net/uploads/4365541/normal_6056c962a9cd0.pdf
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fd3d3430e3aa.pdf
    • https://cdn-cms.f-static.net/uploads/4460709/normal_5fe724e182cc5.pdf
    • https://static.s123-cdn-static.com/uploads/4408599/normal_5fdfab61608f3.pdf
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/0dde8080218.pdf
    • https://cdn.sqhk.co/noneniwetav/jiJNgjU/nuclear_bomb_3d_wallpaper_for_phone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_5abd488b57574c489f9828f172190d7f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d631ecb5-2140-46d9-92ea-b8c2b374fa50/star_trek_the_next_generation_movies.pdf
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_32ad98295d93453381a72aedd1cdad51.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9f082c6-c554-4949-bec1-512da802a09e/tunilonetutevabavije.pdf
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_e8e394ff0cae4f36a12b712c7fec7f83.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e72f70c8-fec8-41d0-84d6-090b65f1e690/how_to_link_paypal_account_to_wix.pdf
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_959795e5719f452ba3d0fec19e9b754a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37a.bin
865ccd715e3ff570798a9bd7433ae5ea3e2f8e474a2b7029876032c795bf0b21
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 5252 bytes
font_01_sfnt_off0001055a.bin
97e36cd373deb0ea3f184422d2ec3c614d6bf7e051cac875a3753e409fc85e02
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 10520 bytes