Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf27af5a47b319f…

MALICIOUS

PDF

74.0 KB Created: 2020-11-25 18:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 47c34d5a7398d42983881b283b694c4b SHA-1: e37a1397aad7a183c6356985dd614f557002f5a4 SHA-256: cdf27af5a47b319f0ef0f83d7dfaaa5731f011a48e1f94627597e5f735107b72
196 Risk Score

Malware Insights

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

The PDF file contains a lure related to "A doll's house quotes about freedom" and embeds a link to a suspicious URL, traffnew.ru. This URL is likely used to redirect the user to malicious content or a phishing page. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning tactic. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/123?utm_term=a+doll%2527s+house+quotes+about+freedom PDF link annotation
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/molabixaxekibi-fukanosabituf-sulumunovitadez.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/2840290.pdfIn PDF document text
    • https://vejugowe.weebly.com/uploads/1/3/4/5/134506523/govub.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/aba90f4c-8f5d-491f-9f6b-d68918119d01/tudurefiwogofosimodop.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/optimization_in_operations_research_rardin.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/l_affaire_calas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/362c5412-816b-4df2-a145-7f48c7827628/thoptv_app_download_in_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291d7dfd-d6ba-410e-a13d-e2efa16986e0/xigawodovujizaxididedaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731b7933-d9bc-48ae-82d5-32c892d34020/48762900783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce41df84-f25a-4867-aced-0ada1e269a6d/series_convergence_tests_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/cassandra_the_definitive_guide_3rd_edition_github.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/1583620074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d82b5c7-e7af-487d-83f0-aede1537ef43/alvin_and_the_chipmunks_theodore.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/47702442655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee39c67a-62a8-41fe-9dbf-4b408cdbd3c2/woguzebazotuvufefefuzuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3db004d-44d2-4957-a278-f6a5f6e341bc/papazakubegi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 5436 bytes
SHA-256: cfa3de705b1ec53d1ec36c93437ba7af93f3e13bc66d2e9010043e928b231eb3
font_01_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 10260 bytes
SHA-256: 33a19e76b32db0d65af2179b0cf7db041b2ce52a07dfbce4e17e7a6e131b07c3
font_02_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16096 bytes
SHA-256: 292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87