Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed731854c102656…

MALICIOUS

PDF

78.5 KB Created: 2021-03-07 17:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b1da1860e8c8b43ea5bfd5d5097a6b7 SHA-1: eed23ab85e78889404040b4f11e02dba24e99317 SHA-256: fed731854c102656a5bfb1bd7096c966aafe76d15c75bf9b8c83850451d5e01e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, which is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=dead+effect+2+apk+revdl
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/eb52ef86483380.pdf
    • http://fibutogu.mywebcommunity.org/11116619095.pdf
    • https://levufiturosotin.weebly.com/uploads/1/3/4/4/134466711/b107abb3534a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vawoginele/vozitixotojoxesomato.pdf
    • https://s3.amazonaws.com/ratixifo/criminal_case_pacific_bay_hack_apk.pdf
    • https://s3.amazonaws.com/pavujiniz/how_to_search_image_on_ipad.pdf
    • https://s3.amazonaws.com/liguwubore/just_leave_me_alone_images.pdf
    • https://s3.amazonaws.com/gawabog/50639073245.pdf
    • http://telusomabufa.onlinewebshop.net/will_ahsoka_tano_be_in_episode_9.pdf
    • https://s3.amazonaws.com/moduluzuxikari/75697075231.pdf
    • http://romakilax.myartsonline.com/40954996406.pdf
    • https://s3.amazonaws.com/juzinaramip/amma_nanna_tamil_ammayi_songs_free.pdf
    • https://s3.amazonaws.com/begijufadi/answer_back_definition.pdf
    • https://s3.amazonaws.com/nijudow/lose_yourself_instrumental.pdf
    • https://s3.amazonaws.com/jolunenafobuw/club_car_48v_battery_charger.pdf
    • https://s3.amazonaws.com/mamibis/fender_mustang_i_v2_20-watt_1x8_modeling_combo_amp.pdf
    • https://s3.amazonaws.com/lorugipopuxe/newuwebojuritugege.pdf
    • https://s3.amazonaws.com/sewamos/mosifuxogewejujagomeva.pdf
    • https://s3.amazonaws.com/neviwove/vobarikapozomututasexe.pdf
    • https://s3.amazonaws.com/bulujono/39124882046.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e671.bin
ddf8208361ec8b5fd5ef7e003fba2736697a61a293ddc0f040522469fdbef574		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 5228 bytes
font_01_sfnt_off0000f85b.bin
0b3782a72a0c200f8872ca409705f575f6d03a6c9e6e59e5c9396084b0339c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 3280 bytes
font_02_sfnt_off00010435.bin
2ea54a56079250e088878cf9040b465ce47d52374e6f58a22a1d62badb3b5d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 12360 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.