Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f971eb47f4b36d7…

MALICIOUS

PDF

72.0 KB Created: 2021-05-10 21:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57039b18ba833f9d51f7ad0005c3da48 SHA-1: ad37c0f4293c909c227f761128f2017c98c10fb3 SHA-256: 9f971eb47f4b36d7501ebdb68106a2b494b4084de608ef307008970a68ef9d6e
126 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. The heuristics reveal it functions as a link farm, with numerous external URIs pointing to various domains, including one that appears to be a redirector. This suggests the document is designed to lead users to malicious content or phishing sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://resalured.ru/strik?utm_term=systemverilog+assertions+and+functional+coverage+from+scratch+download
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/94d2b43f31ea44.pdf
    • https://cdn.sqhk.co/vazoguzo/fdK2ihe/69244991141.pdf
    • http://talemine.getenjoyment.net/84153524322.pdf
    • https://gukilebulasule.weebly.com/uploads/1/3/2/6/132682884/1512881.pdf
    • https://cdn.sqhk.co/matajikiwov/hc4h0Nf/spellbinders_large_die_of_the_month_june_2019.pdf
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/wedif.pdf
    • http://fuwefepor.iblogger.org/chamatkar_film_song.pdf
    • https://kazubuxupopa.weebly.com/uploads/1/3/2/6/132696048/fururikiwisu.pdf
    • https://cdn.sqhk.co/mawejoxejobe/pjghfrw/bubble_shooter_3.pdf
    • http://lorowivo.22web.org/l_adoration_du_saint_sacrement.pdf
    • http://muzibatixabu.mypressonline.com/jafawixixopegapibefikejuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dalegesezo.rf.gd/professional_growth_plan_examples.pdf
    • http://moferamobonar.epizy.com/85768444642.pdf
    • https://s3.amazonaws.com/bagokiko/verizon_ellipsis_hotspot_review.pdf
    • http://talavapupaniv.rf.gd/az_100_exam_dumps.pdf
    • http://nidudovuj.epizy.com/zkteco_attendance_management_program.pdf
    • https://s3.amazonaws.com/genedesowul/gexikasidakofazemonedu.pdf
    • http://karelovaluz.epizy.com/35840988037.pdf
    • http://vedezaduxi.epizy.com/equivalent_fractions_sheet_1_number_lines_answers.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_off0000d84e.bin
cc7e6e8fed03001072272999f759ebd518bee81e895fb692a7ad97c78672e8c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 5792 bytes
font_01_sfnt_off0000ebf1.bin
5174a00d8174932faf74140e82365e41600203b9e4d1b4c7610474e18dc34c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 11220 bytes

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