Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8cf49e31d17203…

MALICIOUS

PDF

84.0 KB Created: 2021-03-30 19:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7182db676ae9d28393cc6605b256a2c9 SHA-1: 96d1120a4f4bdbeeece2baafcd8902d93cd6e3fc SHA-256: df8cf49e31d1720308980ca61d770d85186e95883fc9e59133c5135471c1c4a5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a redirector for a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://bologen.ru/123?utm_term=sheet+piles+uses PDF link annotation
    • http://kaboliwup.mypressonline.com/naziribifapar.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/birth_plan_ireland.pdfIn PDF document text
    • http://baxusajatos.sportsontheweb.net/13256008067.pdfIn PDF document text
    • https://cdn.sqhk.co/lokalofobox/Bhpohbs/machine_background_music_ringtone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_601b8d0bf2bcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5ff3b8e799b9b.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/ii1gfie/56715740127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_604496519a3eb.pdfIn PDF document text
    • https://cdn.sqhk.co/roduxokixuzi/gdnhh3Y/wuwumisutesusoteg.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/2nQhgjc/safaku.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/accounts_receivable_supervisor_job_description.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/97803147559.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/chinese_restaurant_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/94W6Xjf/top_100_best_80_s_rock_songs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwijiti.myartsonline.com/kerisoxaruzigavuvukelid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46943509-7eb1-488a-9e7a-b107850c0e04/is_the_canon_mg3220_a_wireless_printer.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/42135338282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704bc95a-5805-47c4-a9ab-050901f06995/mercury_efi_225_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b6aaba-2fce-47ba-94ab-b92e2691a4b2/polk_magnifi_max_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2a27f6-223a-4ef6-a9b0-4f02017c1e18/star_trek_discovery_season_4_episode_guide.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/65780100205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82fa6b5-c22b-440c-bbc6-1752636dfcf9/short_scary_stories_for_middle_school.pdfIn PDF document text
    • https://www.cancer.gov/coronavirusIn 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_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 4704 bytes
SHA-256: b4e212810e94f4e3d7097b0f4f53a6e1b6358669c8d5624b5adbf40384a28549
font_01_sfnt_off00011d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 11084 bytes
SHA-256: c37b73ff281d20cacc90de9b7b82f7f6d5153f852b9f4e6722ec20d0d41843f0

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