Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42a80e03aeb78a6…

MALICIOUS

PDF

78.0 KB Created: 2021-06-10 08:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e8a81ecea743acb7440cb5faeddab0c4 SHA-1: 40e2311d30a2bc694a1940fc81cf16f2f68d6145 SHA-256: d42a80e03aeb78a67e2d73328843e4b76bac228ff009f25d25af54da97f02517
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains a title related to making slime, which is likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/pbw?utm_term=how+to+make+slime+without+glue+or+borax+or+cornstarch+or+shaving+cream+or+contact+solution PDF link annotation
    • https://zelubofiwexuf.weebly.com/uploads/1/3/4/2/134234915/d65939531.pdfIn PDF document text
    • https://foruvojupizife.weebly.com/uploads/1/3/4/3/134352799/jakexerobuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5fe24f2273c25.pdfIn PDF document text
    • https://pefeluleno.weebly.com/uploads/1/3/4/6/134698673/e3feb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_602badbfda019.pdfIn PDF document text
    • https://xetiwokew.weebly.com/uploads/1/3/4/7/134741649/917ab421371f.pdfIn PDF document text
    • https://pesilukijirizi.weebly.com/uploads/1/3/4/8/134864792/b51f0314e.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/2083571.pdfIn PDF document text
    • https://tipiridevozono.weebly.com/uploads/1/3/4/3/134349557/2243521.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/a33e0851-8528-4df6-b254-555f89e63368/tujofenejaloketumafinebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c1c497-e37a-40d2-b70a-f523aa2a2b92/12516216297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61dfbfdc-5660-4f80-8a0b-7ebc7bd68f96/what_is_the_best_offline_music_app_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7de2e80-f041-4185-8ee4-8e053fea9f93/how_to_unfreeze_ge_ice_maker_water_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61648a7-387c-4eac-ae23-b223e1e70508/11066433863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fde3d1-e795-47a4-ab43-06ef37c12e6a/kujevetasetetozuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee4f538-4353-4c6c-b956-57d96001ad1c/64434104206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0b16a8-fc44-44bb-aa81-b81857d3ec6c/53235932927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8a5ab6-b66b-461b-80f3-088faadb623a/world_of_silence_max_picard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4583bafa-9738-42d9-918d-325f03aac479/jeu_de_carte_a_deux_joueurs_facile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d98ed7-0e35-4ad6-8474-ea746a0ff760/xulisipejovowefujevuvina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf74e5ee-6fbf-4b25-9b37-b5fef282874b/how_do_i_get_my_sandisk_usb_to_work.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 5596 bytes
SHA-256: 54080e994bc886d3d7e524fcff221aa2e51c74189137c68fd14e8ae05126b9b2
font_01_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 10256 bytes
SHA-256: b07829b29345e406f4b8d4ae55e29b3bb540756e6c7fb8f6f34f877a95f4330d