Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c28b1240f81756…

MALICIOUS

PDF

123.6 KB Created: 2021-05-30 09:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32018aca7056ab698f0e32a4289ceefa SHA-1: 2862ad6e4ecc05dcd66b8a43236c264f7f150b77 SHA-256: 70c28b1240f817567de770754f2f7a4b5ddfc721afce911d7b0fd76734f9b069
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection scheme to distribute malicious content. The document body, though heavily obfuscated, contains text related to 'answers' and 'wkhtmltopdf', hinting at a lure or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=did+you+get+it+level+1+pp.+97-98+answers
    • https://witudaki.weebly.com/uploads/1/3/4/3/134332653/xipus-ritedawakiriv.pdf
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/3139999.pdf
    • https://cdn-cms.f-static.net/uploads/4463286/normal_606adea392012.pdf
    • https://pavenepono.weebly.com/uploads/1/3/1/3/131383439/5874100.pdf
    • https://cdn-cms.f-static.net/uploads/4500430/normal_601d3b7a7043c.pdf
    • https://pazixexawa.weebly.com/uploads/1/3/1/4/131437352/1153939.pdf
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/zujurew_ziverebixekil_javetasoviniv.pdf
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/fadosisipufab.pdf
    • https://muzunamarufo.weebly.com/uploads/1/3/4/4/134463020/xetorivazawog.pdf
    • https://talinupujisen.weebly.com/uploads/1/3/4/5/134591269/5342053.pdf
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/mugekupomiral.pdf
    • https://static.s123-cdn-static.com/uploads/4477387/normal_5ffdb995ea614.pdf
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/gizifasunowigumof.pdf
    • https://cdn-cms.f-static.net/uploads/4412154/normal_60699b1703067.pdf
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6037d58ed291d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e379d0b0-f8b1-46b5-aa91-178d34e39add/safupalopuxuz.pdf
    • https://uploads.strikinglycdn.com/files/93d2f452-dcba-4662-becc-17078a5747b1/latest_us_election_news_cnn_live.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124a9.bin
7f43594e20efc43dddd0ae92cf10fc796d6afebf2dc70524504cb8298d53b804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 6972 bytes
font_01_sfnt_off000135bf.bin
d2993555c7a9156fea20e2014d68d2ed8405ffd904e44bf10a9d5f569a4d1bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 11100 bytes
font_02_sfnt_off00015a3c.bin
c152e036e34e8c695c6890c1bdc6223f5f9b2ade3b72356afca152887f37bd22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3C 5928 bytes
font_03_sfnt_off00016eac.bin
3f432abed8038f7359140dde7f5775b53c3208fc1666670f186498b544957381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAC 21308 bytes
font_04_sfnt_off0001afdc.bin
15e72efcd3a9e2f49990ff08929f921eb211c44259e4f81a876d63ae1c2e1421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFDC 19084 bytes
font_05_sfnt_off0001cf76.bin
0b94e18f30917f673bc1602ce6a27f35fe051477d4dcdbbc3fdbc9691b8b1b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF76 6456 bytes

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