Malicious PDF — malware analysis report

Static analysis result for SHA-256 555406ec40e08bd0…

MALICIOUS

PDF

77.3 KB Created: 2021-05-23 16:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 213bc1d1c639cad45066c52379b32e52 SHA-1: 446786047de831b5d436fbd7995a3380146a5278 SHA-256: 555406ec40e08bd0b1be409e95969f4f947b4795f02fb60125d9e957295b7470
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one prominent URL pointing to 'baarspo.ru' which is associated with a search query for installing Android applications. This suggests a phishing or social engineering attempt to trick users into downloading malware disguised as an APK.

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://baarspo.ru/strik?utm_term=adb+install+apk+install_failed_version_downgrade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446382/normal_5ffd4c73d8bc3.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/banobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_605b8a03c5895.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/9047802.pdfIn PDF document text
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/gutuxu-bapofinininize-tukinibovaf-gogebivapozis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusori/28557099256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b9c740-3af0-428e-952c-102e6f55ffaf/what_do_plants_use_from_animals.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/mcent_browser_old_version_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/zisexojuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/machines_like_me_ian_mcewan.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/32194426718.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/brche_krzen_erklrung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281ae434-a06b-4695-8367-0c29fa6551ea/end_the_fed.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/guinea_pig_diet_fact_sheet.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_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 5584 bytes
SHA-256: 0beae825cd04a45bdc2aafe0aa63970e950caf8983c3264b1ff544ce00f9a9f3
font_01_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 22628 bytes
SHA-256: 8026313f0ca3d9c6cab019dd0739e16e46d5dd76d268302d94003866933562dc