Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b2e88b5cb97a4c…

MALICIOUS

PDF

76.0 KB Created: 2021-05-21 10:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 300b7ccfca776fbc7a036a1f7e7c71c8 SHA-1: e534ff8b29daa6a279bd87ed27122e237e6d5df3 SHA-256: 19b2e88b5cb97a4c098d2b592654c764787eed683e966f770731c411be09dd40
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of many external links, including one pointing to 'jottigo.ru', suggests a phishing or malicious redirection attempt.

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://jottigo.ru/strik?utm_term=costumbres+de+los+punks PDF link annotation
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/pipepagamotamelepisu.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/4eb14d0e7c.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/xetipusopokizu.pdfIn PDF document text
    • https://tunilawogipafex.weebly.com/uploads/1/3/2/8/132814387/taxexed.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/8163376.pdfIn PDF document text
    • https://zejotagidegixop.weebly.com/uploads/1/3/4/5/134522105/70fdba.pdfIn PDF document text
    • https://mufobaxepomek.weebly.com/uploads/1/3/4/8/134866816/motig.pdfIn PDF document text
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/4583271.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/vogusirosopobe.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/dfb7d45d457644.pdfIn PDF document text
    • https://kivenawuvu.weebly.com/uploads/1/3/1/1/131163776/jebijasobudusem-kupofa-vofeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b493e18-4aa0-4fe6-8f56-e3a16973b809/what_is_d_meaning_of_conflict_resolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713df266-cff8-4df3-bc38-cdcc5f80b099/sodastream_refill_price_target.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/famuzusulipitixodesajebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58c54ef-2de4-41e3-ad7e-f92eeac36ca2/wewexezaputimavadi.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/harry_potter_game_2020_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae47311a-5ac3-410f-9cd1-d9830a3c274f/thor_walking_blood_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401c6ec4-ac03-4f97-a331-72233ac9376e/does_diamonds_go_up_in_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e6b5e7-852f-4abc-82d2-eac0ab385b54/28382740136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d44751-050f-4b95-b793-46de65a4e44f/4257926661.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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 5004 bytes
SHA-256: 529f6b37eabecc9b13b24f6f7ea30ff757d2e5609f6872842e30ad9bb7775036
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 11828 bytes
SHA-256: b2fb0a52aa56ebcdaaf737fbee96847fa1c5af2751bd4e0017a052370672afbc