Malicious PDF — malware analysis report

Static analysis result for SHA-256 552a07e62aca3eda…

MALICIOUS

PDF

73.0 KB Created: 2021-02-24 12:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e75dfaed90db8116fe7c0288114a688 SHA-1: f526f92ee7c6c5161ccf471935606f624bcd7e9b SHA-256: 552a07e62aca3eda44f1a2409e1dc8dd53b7dd944540ceb2bc87785b4ab0fdac
156 Risk Score

Malware Insights

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

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 SEO manipulation tactic. The embedded content, though partially garbled, includes a URL that appears to be part of this link farm, potentially leading to further malicious content or exploitation.

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 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://jottigo.ru/aws?utm_term=speed+queen+washers+and+dryers+for+sale PDF link annotation
    • http://sdfsdfsdf.shaketorch.com/78126009406.pdfIn PDF document text
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/sadatix_dujowu_vopekij_petomaperi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5fcd42ec25ea5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5ff6c9824c3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5fd8ff09cb063.pdfIn PDF document text
    • https://jefelowomiwit.weebly.com/uploads/1/3/4/5/134599681/1092494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_5fd9d220b77ff.pdfIn PDF document text
    • http://foteraza.22web.org/91213120356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369343/normal_5fdebee9ee8ea.pdfIn PDF document text
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/458d1df9b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_602774828a43e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413240/normal_5ffd75ae4e479.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tazibabebamep/gebizibumofizedugidixewam.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/ubuntu_16._04_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/school_things_vocabulary_worksheets.pdfIn PDF document text
    • http://zewuref.rf.gd/lomojokigolawefitodif.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/41787187946.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/firewall._bat_windows_10.pdfIn PDF document text
    • http://nufavonazimu.epizy.com/tipoxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 5308 bytes
SHA-256: 0619e101fcef88f355d97bb126e809d56b8e2b4dd196d52028f1079ee0454b6f
font_01_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 10608 bytes
SHA-256: 3d994237e83fb0f80e84ee2361d34886a32cc34ac9fbc33b6bce284117435df6
font_02_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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