Malicious PDF — malware analysis report

Static analysis result for SHA-256 4794166625f6bb08…

MALICIOUS

PDF

74.3 KB Created: 2021-04-06 13:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4851614008df52c4e41bb9715ad88db0 SHA-1: 6eb38d8ba51c0592fa2db9b7de1db8a08feab095 SHA-256: 4794166625f6bb0879219f471e70f56a0a52883d0b2b62126946655675b570e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, a technique often used for SEO link farms or to distribute malicious content. One prominent URL, https://xezojetit.ru/strik?utm_term=how+to+train+your+dragon+4k+wallpaper, suggests a lure related to 'how to train your dragon 4k wallpaper' to entice users to click. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=how+to+train+your+dragon+4k+wallpaper
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/wokesobe_zikijijebob_fubimudegexunu_negikipukulonak.pdf
    • https://kijilijesudopob.weebly.com/uploads/1/3/0/7/130739968/481f43c5.pdf
    • https://varozuwibudod.weebly.com/uploads/1/3/4/3/134327914/3055837.pdf
    • http://tenipimutav.mywebcommunity.org/amnesty_international_death_penalty_2020.pdf
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/wofopujixu.pdf
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/cfaf3.pdf
    • http://omerkatanalp.com/sherlock_holmes_series_download_in_hindi_720p_worldfree4ugh3jv.pdf
    • http://gefosezidubajoz.scienceontheweb.net/nedebutisepijo.pdf
    • http://jobauthor.online/42761392548h0ow0.pdf
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/sanukenusutuxaxu.pdf
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/0c5d7.pdf
    • https://xonaxogurevof.weebly.com/uploads/1/3/1/4/131453171/2886cfb.pdf
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/3298505.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jomopizemiz.onlinewebshop.net/principios_de_quimica_libro_de_peter_atkins.pdf
    • http://wifofevowogak.onlinewebshop.net/vizes.pdf
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_543e8232f26c4d3aaab3132df279c182.pdf?index=true
    • https://s3.amazonaws.com/ponivotigegepub/xiniwimimuvulupideb.pdf
    • https://s3.amazonaws.com/nitajosasa/bijev.pdf
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_bb9591aecddd4930842e15a37d5ab605.pdf?index=true
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_626427c19e524d839e0613219cf7c088.pdf?index=true
    • http://wobanunep.myartsonline.com/how_do_you_calculate_flow_rate_through_a_pipe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin
3d0af428076a8fec474e7008537c60a2e046e6c421baddfe7643f0d1356d0041		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5256 bytes
font_01_sfnt_off0000fa86.bin
32730ce7cf0986b8f0b2a8f2f2bdc53fb31231ddb96496760d0cb88396fc17d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 9792 bytes

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