Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac25843e477aaff2…

MALICIOUS

PDF

81.1 KB Created: 2021-02-10 19:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4c23183e1069798e422c3712049f8dc2 SHA-1: 125d466042e56d6c125751e1b1de1c8113e421c4 SHA-256: ac25843e477aaff276af62a0480221dfbeae4f956c65141c20df3f9fd304f662
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' pointing to potentially malicious content. The presence of multiple unknown URLs suggests an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/aws?utm_term=beaglebone+black+python+tutorial+pdf PDF link annotation
    • http://voxemukam.22web.org/99571261349.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/dewemikexax.pdfIn PDF document text
    • https://xabanemexe.weebly.com/uploads/1/3/4/4/134443602/jejudubutu-vuzemizasikiron-nunufo.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/vazepoxopolilidun.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/wopez.pdfIn PDF document text
    • http://gulibej.22web.org/empyrion_sv_building_guide.pdfIn PDF document text
    • https://mepalowe.weebly.com/uploads/1/3/1/0/131070826/6c8a023.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/bedetatiditik.pdfIn PDF document text
    • http://naturagrush.space/80426968674z0big.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/fanojtjr2y.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/zikawesagavuxus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mavalivum.rf.gd/sony_vegas_pro_16_crack_file.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/background_music_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/eicar_test_file_mcafee.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/10879556723.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/xosuxugifu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/java_calendar_12_hour_format.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/tepefijogaxedaxiwasuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/14439892473.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/93402272627.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_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 5596 bytes
SHA-256: 2bc6e86803fd33d3ce38a27a866276c854157b3097c930577d284afe557101a1
font_01_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 11236 bytes
SHA-256: a784bf1fd22751e5835e6736231d5a3018f78294abe6ded564de5eb66627c5e6

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