Malicious PDF — malware analysis report

Static analysis result for SHA-256 033a73be73cbfde8…

MALICIOUS

PDF

69.2 KB Created: 2021-03-19 13:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cd0301200edb7b5c168f49fd2b152497 SHA-1: 9f609e30b665783df4c11c091a3b86de516a0509 SHA-256: 033a73be73cbfde810067bf639850e22d055ea4740804278c044a3cc7c0c9263
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://golowaki.ru/strik?utm_term=twilight+graphic+novel+volume+2+online+free PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_23fe2a4ee30e471badb39cd7242d3c18.pdf?index=trueIn PDF document text
    • http://goxafufi.rf.gd/knoxville_weather_report_7_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feea5bc2-416d-4c5d-9a10-981ceffabe35/79508401567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ae94b0-636a-4ac4-971e-e46d1f50dda9/tugujerujamirejuxin.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/lagu_yang_terdalam_versi_reggae_ska.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_f5ca25ad13814727bd9f3adb943e563e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d485f9f-5441-4257-985a-5791560fb054/samsung_galaxy_grand_prime_bd_price_2020.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_999be71f946f4993844c7b41df2bf3e9.pdf?index=trueIn PDF document text
    • http://zogutofarori.epizy.com/winelevemojasezum.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_97632f05b0204848beb3c2ddc5d9f611.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_f4df224345a240e3bc36bceded5f21dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roware/zolifu.pdfIn PDF document text
    • http://pirumikerivij.epizy.com/93466645889.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_975b516df88a4732832238b7e2cfa9f2.pdf?index=trueIn PDF document text
    • http://nuzejotegaze.rf.gd/lupirafe.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/cgi_full_form_in_films.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345a9c52-ea45-4db1-91b8-fd84fdda66d9/what_does_multiple_linear_regression_tell_you.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/what_does_contemplate_mean_in_the_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1a7fc4-5b26-4df3-ae27-55baa1b73110/tabazafobekuwijixe.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_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 5484 bytes
SHA-256: a4b0245d1571b1eefd2cc7a98bf6b37d66180d8b5b8ef724764e5c7f89a8f39e
font_01_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 10296 bytes
SHA-256: f178a42a9beb9d2229c43cc1a816590e7773edb63c8e2b379670237139c8fbbd

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