Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b0c4654cbe4e67…

MALICIOUS

PDF

78.9 KB Created: 2021-05-11 10:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c610f5b76711c88282482f68637b8819 SHA-1: 20974e2247c8e06197a2a30d0784a1870b2c3f28 SHA-256: 71b0c4654cbe4e67c4caaa78a29623f823f0afafd1248f59d60d317180df1fc6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to an antique sewing machine, which is a common tactic for phishing campaigns. The embedded URL, https://soxebez.ru/strik?utm_term=antique+hand+crank+singer+sewing+machine, is identified as a redirector likely leading to a phishing page. ML and ClamAV heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=antique+hand+crank+singer+sewing+machine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459323/normal_5fd069eb153a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ffe2a28b2bae.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/5jcyjgt/ordinal_data_types_in_ada_are_called.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421640/normal_5fe343a562aac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417033/normal_5ff76f3cdbb1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389384/normal_5ffa9fc70eb5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5fefa7c0aec30.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/microsoft_training_path.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/busilodazenuxuwegu.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/hfidoig/translate_on_screen_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_604cfb7e7dc44.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d8fdc6-b13e-4f36-856c-bb8c64f1c229/vatigokosoxerurosis.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/gap_analysis_template_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd2974c-9064-419c-889c-9be1171c5964/33930566913.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/bangla_funny_cartoon_video_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/56684041431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee364be5-8a63-4b32-ba9c-220f6f7e5c1f/average_salary_masters_in_counseling_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/xageju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023a1a37-0ec6-405b-bc0d-6a755f4e0b59/91341077649.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/wemegad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f408256-03b7-4ea6-9b89-5a44fc1134cb/moon_river_chord_melody_guitar.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_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 5592 bytes
SHA-256: 04e9982cdfd56f1522485499789c1e4a2ae454d88842c087cf059156c920003b
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 10648 bytes
SHA-256: 24d276ee061c162f15ac5aa26f7f246614b856776ff12f917d3d3e50088d27db

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