Malicious PDF — malware analysis report

Static analysis result for SHA-256 7879c840545b8940…

MALICIOUS

PDF

82.6 KB Created: 2021-06-05 21:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6bc322cdf4d5a4755dbf8eb4439b2568 SHA-1: 048fd125a38a04a1dd964d227db703cef069184e SHA-256: 7879c840545b8940cdf8356ffc04e42ccf0dc0211e086f150218e5fb4b9a1928
186 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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://garglob.ru/pbw?utm_term=coniugazione+verbo+essere+in+forma+passiva', is particularly suspicious and likely leads to malicious content or phishing. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://garglob.ru/pbw?utm_term=coniugazione+verbo+essere+in+forma+passiva PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459645/normal_6010562b21ce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_6069e4183e2e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_606153b08ebfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421767/normal_5fcb5c1abb8af.pdfIn PDF document text
    • https://wugexufaferefe.weebly.com/uploads/1/3/0/7/130776446/8053301.pdfIn PDF document text
    • https://pofekivivefuron.weebly.com/uploads/1/3/5/3/135339802/1738b7e5c.pdfIn PDF document text
    • https://kujogumaras.weebly.com/uploads/1/3/4/4/134497752/8129808.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/guletosabifexiranuxa.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/labusabidova_bewukanabisiso_sobarego.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/xizinarudofageberu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6f0ccfc1-dcf9-4f62-883d-e12bfb10e57e/al_quran_30_juz_mp3_free_download_sudais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf148572-a577-487c-806e-2257cb919786/42493071462.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144573180/xadirapinokafeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1922f00-1df8-4687-ae5b-88dee4f662ab/mamol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d45fbf1-7d30-4cfd-8e45-9688b16d3c32/zagg_slim_book_keyboard_case_for_ipad_mini_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28acd87b-ace8-401c-ba61-246cb198b478/diono_radian_rxt_car_seat_lady.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80cf0d94-ec4e-4a64-bb9f-bdf73309f121/13404765051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba0f25e-e4d6-4f39-8546-9484822c3a41/how_do_i_refill_ink_cartridges_for_a_hp.pdfIn PDF document text
    • http://pewamez.pbworks.com/w/file/fetch/144612306/iphone_activation_lock_bypass_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec9b4b1-4e6b-44d2-a6b6-a806e1f401b1/jusedivubomaxafir.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 5264 bytes
SHA-256: 54a13b4ad0a2563bba81029f9702ffb90d5877c4cc693fcd2284bd9cd6e7e1c4
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 11956 bytes
SHA-256: 88fc93304038209f13cea6a78a5cd773b026339d44bc649798b67fd125479aa6
font_02_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 16288 bytes
SHA-256: 3a203c1af364fd50926ed0e252809f0c7a30e600467c7ed9f1bbae23c355a878
font_03_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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