Malicious PDF — malware analysis report

Static analysis result for SHA-256 b755b4e88673eee4…

MALICIOUS

PDF

99.6 KB Created: 2021-03-25 08:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b8b67bdeb0a6d7e363469fc997a4a692 SHA-1: 9b427ceda83e637668580468bf36871596273360 SHA-256: b755b4e88673eee4a90642c406455ad0b8e325f0fb5ef2f14df97ae7b1830900
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=jet+xactasaw+parts+manual+pdf PDF link annotation
    • http://rojibitakuvekuw.scienceontheweb.net/animus_and_anima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_5fe9a33797997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480155/normal_604676232178c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_6026ece1d8f29.pdfIn PDF document text
    • http://zujewap.mygamesonline.org/multiple_intelligences_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fe6b36494152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_6021843c1e35b.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/wiwuxot/informal_region_geography_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/99725586772.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/56142872334.pdfIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_cd16d8c9552242239622bc5a89027bdc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavale/guvivobafirimixenegamufu.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_2e089e4f7e14477c9a437caffef4738e.pdf?index=trueIn PDF document text
    • http://wugetad.myartsonline.com/nawelotazozipobikaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/block_strike_hack_dinheiro_infinito_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/adobe_reader_for_pc_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce515736-65b1-4b61-ba82-562aeada47c3/diary_of_a_wimpy_kid_wrecking_ball_read_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/ledukukozeliv.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/nimofilefobas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c312e182-af68-42f1-98b1-1c59e32bf23f/alfred_all_in_one_piano_book.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_d209d86bd7af46c1b93e157a00c8d30d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e292494-8147-4b70-b13b-e950779c4cdc/what_type_of_oil_does_a_2017_nissan_pathfinder_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74514c6-d78c-42d8-990b-81df739432e1/84838798847.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_57712eba41b84e5781a6b8823cf0ea0a.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001368e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368E 5448 bytes
SHA-256: a10ba6864df2324670cf34bfcf9594551e1c4e52d28a5f5d17f91794f5c08363
font_01_sfnt_off00014917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14917 11360 bytes
SHA-256: 65d7cd8a045e679d69615810c1accf7ff388769f451478291558170309edecde
font_02_sfnt_off00016ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF3 6204 bytes
SHA-256: 1f07b9301cdd003b48e948a7a01027571df7698bf589638d472ddf0562eca19d