Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c1f6636bc766f3…

MALICIOUS

PDF

86.7 KB Created: 2021-03-15 10:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9de5712d7dce500eaf4697a18f57dd0d SHA-1: 5da5d9e435f80cec38e28936634af9ba6f81f5df SHA-256: 19c1f6636bc766f3aefd8846f82cae8a6bbba8e1dd3301ff53102ef89826e153
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 0.9996

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://dafemum.ru/award?keyword=example+of+balanced+scorecard+in+business+pdf PDF link annotation
    • http://rusherx.studio/wapimafazaxivodutobe4qdzl.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/speedbit_video_accelerator_activation_code_keygen.pdfIn PDF document text
    • http://playmarket-online.com/144452181560dd0l.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/2jhnKei/sausage_dog_running.pdfIn PDF document text
    • http://aromaita.space/how_to_write_my_hobbies_in_cvdayg7.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/72599378829.pdfIn PDF document text
    • http://idealica-italiaoficial.site/69064950333dpn31.pdfIn PDF document text
    • http://menbp.online/delonghi_oil_heater_timer_manualyes46.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/eMihggv/tiny_dangerous_dungeons_speedrun.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/ijXiahb/19766979978.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://s3.amazonaws.com/feliso/short_movies_for_learning_english_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774e3c05-8ff7-4860-832e-fda67e801d0c/dodge_ram_1500_accessories_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/find_someone_who_activity_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f1d985-191c-470d-91a8-ddbefcc402c6/husqvarna_445e_45.7cc_gas_chainsaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df7404e8-6b0f-4145-a1d3-8c27cafe8c07/how_to_make_a_ham_with_ginger_ale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee86f78c-2070-4255-8a11-d922b2285869/27248021216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbff0c01-ae8e-4c68-b2d4-c819455255bd/how_to_replace_goodman_furnace_ignitor.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/how_to_get_writer_on_iphone.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_129f1ee93ec341ef9169a8815980fb26.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_d4ae7ec116bf45dc928500968bdebb2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/bourbon_reforms_in_mexico.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 5268 bytes
SHA-256: 81667abd934e669d1b94e9ce1d431ca30ecab522cbc6285255cc459551434add
font_01_sfnt_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 11236 bytes
SHA-256: 5bd34845f13e190e8ec94e894e39bda3625a838656a6c75270eac73942fc07ba
font_02_sfnt_off00013f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71