Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf66e88ab8d6d50…

MALICIOUS

PDF

75.5 KB Created: 2021-04-01 15:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 753ab15fbdbd0e615f32c5932e797bdb SHA-1: df0391455848bff36d7caa17b2d35b2feb83760e SHA-256: 8bf66e88ab8d6d50aa4be0308887acb0848205455570fa0bbc7969319a3daf79
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/wix?keyword=50+shades+of+grey+contract+pdf PDF link annotation
    • https://bejokezogakuji.weebly.com/uploads/1/3/2/6/132695802/lulimuvefaguviw.pdfIn PDF document text
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/genedeb-binibopof-tuvafu-noporoje.pdfIn PDF document text
    • http://termometr-medikal.site/48120432269yr604.pdfIn PDF document text
    • http://btsworld.org/lookup_value_excel_different_sheetx7s7p.pdfIn PDF document text
    • https://dazowuxope.weebly.com/uploads/1/3/4/3/134319454/tawibiveseranun-zeguzovidojot-nelabogijat.pdfIn PDF document text
    • https://litoxixolemor.weebly.com/uploads/1/3/4/3/134379235/rusopisepirad.pdfIn PDF document text
    • http://com-signto5.xyz/candesartan_available_dosage_formsn2cae.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/aaae495f9d8.pdfIn PDF document text
    • http://adminhalil.com/97403917764v955c.pdfIn PDF document text
    • http://xtreme-sport.ru/66155065565omhae.pdfIn PDF document text
    • http://mnclassis.org/nonton_the_invisible_man_2020_full_movie_sub_indoncg9w.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/ibOKAS4/batefutox.pdfIn PDF document text
    • http://cabinetshq.xyz/guided_tours_israel_cruise_shipbw01q.pdfIn PDF document text
    • https://rimedugomo.weebly.com/uploads/1/3/0/7/130740195/wukepo.pdfIn PDF document text
    • http://changely.club/klipsch_promedia_2.1_bluetooth_review2nv08.pdfIn PDF document text
    • https://cdn.sqhk.co/bedipidis/oaJkTfo/merry_christmas_letter_templates_free.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://sizadomuwegemos.weebly.com/uploads/1/3/5/3/135335556/zetopi_zitor_jupefaga_lorijufimov.pdfIn PDF document text
    • https://rabivavas.weebly.com/uploads/1/3/0/9/130969809/5920595.pdfIn PDF document text
    • http://skidki-day.store/68511007216n8bne.pdfIn PDF document text
    • https://movakesomerinid.weebly.com/uploads/1/3/4/5/134528648/7660697.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/6f04b12d-6b65-4da1-8356-024628a0f55b/7_habits_of_a_highly_effective_teenager_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0870aa-efe8-401b-a587-c6587e1a54f4/kraken_x61_missing_device_driver.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_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 5656 bytes
SHA-256: b91d211f569ee0000111b552491ed15ed0a1795ecebf2a5d4874bbd90e8cfec7
font_01_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 10632 bytes
SHA-256: 6e1af84af1cfc7ccf77a243fe4ad1b043eba3bb95110103864046326ee354e10