Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58fbf1e56c8bb39…

MALICIOUS

PDF

261.6 KB Created: 2021-05-25 12:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3553561746041249296ce77a149c77b2 SHA-1: cad666a655725d1a0bf0212cb0c1d4e254573595 SHA-256: b58fbf1e56c8bb394123a69e7cfca94d18e8fb39321eb382d214173775e368f0
136 Risk Score

Malware Insights

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

The file is a PDF document that contains a lure for free downloads, indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic and the embedded URL. The primary malicious URL identified is 'https://fokemale.ru/strik?utm_term=m+name+image+love+dp+download+video'. ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=m+name+image+love+dp+download+video PDF link annotation
    • https://bivajeliju.weebly.com/uploads/1/3/5/9/135978375/fuvolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477886/normal_606231e4409fa.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/8924124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_6024ee3ecc519.pdfIn PDF document text
    • https://fapovodulutob.weebly.com/uploads/1/3/4/3/134361236/rozerejomurox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5fea0f0ac6e76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fcf03e3754de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371524/normal_5fe2ce195160c.pdfIn PDF document text
    • https://vidanametok.weebly.com/uploads/1/3/4/3/134318125/xeseletule-xolibazu-kekopenemefe.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/2736574.pdfIn PDF document text
    • https://tuzigopidimeb.weebly.com/uploads/1/3/4/3/134320631/29e65f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/free_family_feud_powerpoint_2016_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413ee3ae-4c5d-4757-b275-d39e631ecb0c/degakupijokorero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1141f7-1528-4225-bc7b-b4164224888d/how_to_write_a_conclusion_for_a_chemistry_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37463976-1cf1-454d-9625-d74c6896a08d/daymond_john_net_worth_forbes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a68266-1f9b-4bd0-90cd-3e469beeb05b/87296931172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c42cc8a-fdb8-46c3-a3d1-70d6cac56c47/sotigurajapobawosored.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5d22a4-a94b-4e0e-8343-a7bd0c56bf93/molecular_biology_of_the_gene_7th.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/saberopanimuxajep.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0003d7fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D7FD 25608 bytes
SHA-256: 4b7259af915dadd7945485de5223714fb879ca796cf99a4c29ac66d1a48fd376
font_00_sfnt_off0003921b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3921B 5164 bytes
SHA-256: 2ccf515294d728fc8a77081489b94b3b2e17b6c0c74215487ed5c13900cd3544
font_01_sfnt_off0003a3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A3C1 18392 bytes
SHA-256: 0100eb6412e975646ff0fa090270643b2d0e50481ff23fcd7f32c9a92a73add1