Malicious PDF — malware analysis report

Static analysis result for SHA-256 797aa54a62a1e7fc…

MALICIOUS

PDF

74.8 KB Created: 2021-03-03 03:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3d4bd83bf7cd7c73ddbceba5543423b5 SHA-1: f95b660004773ecf68c69415ccfa494ece6d2de5 SHA-256: 797aa54a62a1e7fce3e8b8f8b74dcbb4ce226c47bb65ed0fecfab3d45be0dc11
186 Risk Score

Malware Insights

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

This 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, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains a title related to connecting a wireless keyboard, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/123?utm_term=how+to+connect+microsoft+wireless+keyboard+2000 PDF link annotation
    • https://cdn.sqhk.co/jabosuve/ziihTih/free_wifi_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/igCUohh/14729499029.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/sasefelulipibofanu.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/hgWgehj/american_conference_football_standings_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/NgcyEgj/laxuremadizesomifekapok.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/iihiihw/wire_basket_wall_storage.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/3680285.pdfIn PDF document text
    • https://vowopazi.weebly.com/uploads/1/3/4/0/134096587/dezuwevuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/ep9hiij/92632267741.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/5252009.pdfIn PDF document text
    • https://rixeludabigadak.weebly.com/uploads/1/3/0/9/130969597/leraxinukevupififasi.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/3727453.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/wudaxe.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/sat_essay_and_subject_tests_cancelled.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
    • 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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 5588 bytes
SHA-256: c1427d171e368d02cd7c95fc0eed208a4f105e70255de9a3f6ad0391011bc7de
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 9444 bytes
SHA-256: 6a8e48665490b5bd49ee0c5cf3637619edd5922adaf6a7badb9f979b4de5d7b5
font_02_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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