Malicious PDF — malware analysis report

Static analysis result for SHA-256 d276199ce5d6a90c…

MALICIOUS

PDF

81.2 KB Created: 2021-03-28 07:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fbbe6423d0bfe6d98dcb05cd77228cb4 SHA-1: cc9515019d47ae81e0a0da6181a893de861be1fd SHA-256: d276199ce5d6a90cbcb6ca05e4b2cfdf39f72be0486e434789ed16dc170a781b
226 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. It uses a password-protected-archive lure. 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 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fokemale.ru/award?keyword=cinema+4d+r20+documentation+pdf PDF link annotation
    • http://test123test.xyz/14463808670cr1w2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_60356eaf4fcf5.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/egjjaje/uncertain_meaning_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/lapotalodige/jih7uyp/kitob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_60306f4626f1c.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/jjgh7je/98665402975.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/PigjesH/64561354949.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/a7Zhagi/92371366517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_602a05c721552.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/5ieVhjb/fizob.pdfIn PDF document text
    • http://tk-pobeda.site/25359237167oxjxf.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/hhHjehf/76761118036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_604ce5a6381a9.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/NNhhia9/cfo_salary_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/Xjdghwo/tower_of_babel_coloring_page.pdfIn PDF document text
    • http://flowerport.store/78134564865qwfdg.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/posaxugidut/math_dice_rules.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_667e9bb976e1442cb1f7a773c5a20074.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_227f4b5860874c0f868aad5e6fc2baa4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legipalofi/10029262432.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_189b5317bab54e14abb45c6f3bd3c758.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_c4106c697c8e41488d32c232aa011786.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 3776 bytes
SHA-256: 5c8ce053674138b26c742fb08c873334dbf42af59d115025b7f97cdbf689aa8f
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 5356 bytes
SHA-256: 39feb0dcbb47be3f33efff98bc06d8740303f84b5054d614d786596ca42a3606
font_02_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 12172 bytes
SHA-256: f11dceed6a6519550b0debe8dbd0f89a78206b793e6b4ca9b556f2c019d42557