Malicious PDF — malware analysis report

Static analysis result for SHA-256 15136c41366ebf32…

MALICIOUS

PDF

87.0 KB Created: 2021-05-03 12:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cd8bee6d5f1a334593cd0b1c185ef2b0 SHA-1: 0a33229b29fd57a65ad1f27170c3da95435c5f4a SHA-256: 15136c41366ebf3271c50a84571efcce144ddb0471489c1819cbe1cda8652852
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=what+is+act+1+scene+6+about+in+macbeth PDF link annotation
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/noniroxunolupa.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/aLtTKyi/76629807118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_5fdb01d3cc19a.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jbrjjkI/futajixibofipemusox.pdfIn PDF document text
    • https://kozikimonewuzo.weebly.com/uploads/1/3/4/5/134592445/1339135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377401/normal_5fe0696f107cb.pdfIn PDF document text
    • https://cdn.sqhk.co/pudamunipum/Mwfgdif/16562531960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459926/normal_5fcebad879e7a.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/tadatax-lapid.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/dizuwisonegal_jofofimixater_dirobe_jiwupaxetas.pdfIn PDF document text
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/88b58fa77.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/loxikuzux.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/voxuku-peruledugexa-pibowi.pdfIn PDF document text
    • https://lujumibuxoze.weebly.com/uploads/1/3/5/3/135350241/608da6.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/lelavigok.pdfIn PDF document text
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/35660.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/0cc59361-e52c-4362-89bf-041a1f7c039a/how_to_get_rid_of_behavioral_tics.pdfIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_2df2bd814dca4efbbb72c8aa412e873d.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_3f4c9ea85806444babc3d3db4718736b.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_83df98a1fa9748cba6941b97db7a0c95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26aedf46-ac7b-4dda-ad3c-370e203e8d85/woguwugixupopigexozir.pdfIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_dcee91944aa6486ca7ab11ec1cb60220.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c99b32-afd0-4e3d-acf7-3caf94841c76/yoga_anatomy_leslie_kaminoff_amy_matthews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21689681-6699-41dc-8ea1-fc89fd0362df/dachshund_coat_colours.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_7a46a0c5065148e0920be25a54cfb646.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 5272 bytes
SHA-256: 688da350966c33f3ff8a81dbe6344b7ef8709dbe60687bd97f1de50599dad9ec
font_01_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 11024 bytes
SHA-256: 5757197a2e6171e0d079b523afbe4056054a6a529dbf2786e48e667874505cd5
font_02_sfnt_off00013908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13908 16104 bytes
SHA-256: cd481ae0c6fd1d1450378d395d947ac520d4497346b2b975ad242cb560c7ef6f