Malicious PDF — malware analysis report

Static analysis result for SHA-256 163cc0dfe3221577…

MALICIOUS

PDF

71.0 KB Created: 2021-03-04 15:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3f29c288af089a6b4e4d89a1d306aa9a SHA-1: d864014f63a6cbf83a420c6ac1a80dabe314889f SHA-256: 163cc0dfe322157735881b978528e10d350dfa711dfc45d43b34af85f25128a4
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=plant+physiology+biochemistry+and+biotechnology+pdf PDF link annotation
    • https://cdn.sqhk.co/vakanaju/iihghgc/w3schools_html_form_attributes.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/30b030ec.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/5203353.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/ap2cqic/wesapowilixinugepezugux.pdfIn PDF document text
    • https://rafomuvufeja.weebly.com/uploads/1/3/1/8/131856077/fisabiroworepi_fimilolanatalor_falinejobaku_wofijazazixawan.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/bbe85704.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/YOnhagc/47878208392.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/3661639.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jhsPhbS/mortal_kombat_movie_characters_1995.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/xebalulizotita.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/U56ieje/diwitasobisaxito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_581c9ec226d54e948b652f3d7b48a10e.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_087665d67f6843c99d61bfa80581a90b.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_f9ebda6b957a4832a8dc969750863c5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/301cd558-6922-48a1-a2b9-55140ea51044/what_is_the_integral_of_csc2.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/outlook_web_access_in_android.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_6875a3862d714e1ca2bfbf0bad36ff11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbb184c-0926-4ab3-ad45-e2e5698747bd/what_does_interdependence_mean_in_an_ecosystem.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/bossetti_sentenza_appello.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_fcc1d1dbf690419789951da932f43675.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/zibowemivoputikopiwuwubis.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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 5812 bytes
SHA-256: 1a453807e059c4792f40d8a21f9713ee1993ee6e50beed7169a6d4a8c76a60b9
font_01_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 10212 bytes
SHA-256: a4dea0883230f65cca225f2b82bd66a8d2229cbc9a922a2b17a2ba545fb94000