Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c440ce7c940eee5…

MALICIOUS

PDF

117.7 KB Created: 2021-05-23 09:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ade1d28f1161230a05a777c4e47dcb0b SHA-1: d9048c07cfc2b4f78a86fb52e7c55c5fa9479b5f SHA-256: 5c440ce7c940eee50992990c5198311406aa3bb20442a32cf5261b681b01ba5d
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. It contains numerous external links, with a primary redirector URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malicious content or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/strik?utm_term=shri+ganpati+atharvashirsha+in+hindi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453734/normal_606b715df374a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_605d73c795654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_604e64c5260dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_604fe59cb1dee.pdfIn PDF document text
    • https://gorixekaliwe.weebly.com/uploads/1/3/4/4/134439057/kifago.pdfIn PDF document text
    • https://jujipepovoduvu.weebly.com/uploads/1/3/4/0/134017188/4075043.pdfIn PDF document text
    • https://joriwonakogilul.weebly.com/uploads/1/3/5/3/135305945/guzatibobatopeloje.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/bepate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/504efacc-88e8-4905-a869-eaf462c47999/how_to_pair_bluedio_t2_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbff06f9-b044-4c00-9941-4603a87da58b/17539537735.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/18730974693.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/wiworeginikesoxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763daafb-c961-49bc-99bb-afe93cffaade/is_monat_regulated_by_the_fda.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/heart_of_darkness_summary_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732c55a2-9976-436e-91c4-a5bd7c7fd416/construction_project_manager_jobs_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/risini.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/8185893304.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/bojoki.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/tv_guide_tonight_brisbane.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/xexapomeluxivazoxonut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b52989-5fa4-4498-9e1d-63d522d49d36/aircraft_mechanic_salary_in_sa_per_month.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14182 5432 bytes
SHA-256: 876c11f177704346e2f7b884c0eb407d47b2a735a2ffd19824dfcf9d8db167a5
font_01_sfnt_off000153f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F9 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00015f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5B 9628 bytes
SHA-256: f59906b1e3a972b95da2bd4a0772eb33d6cba06e23ea769796c160b4af493e2e
font_03_sfnt_off000180a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180A8 24644 bytes
SHA-256: d91fb9bdc09080e0bd5d436bbe0b16269f12c578f640031218ce3e70e848e791