Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b44941b68400314…

MALICIOUS

PDF

96.5 KB Created: 2021-01-07 04:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fa3d50b4ecb7c0aee9e4ea421108e785 SHA-1: 527e7099b87706d03af6c63b717b14703f5471bf SHA-256: 3b44941b68400314eb7bf332ed7330756153543480f412c40d1538c8dd708625
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO link farming. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=soul+sister+meaning+in+hindi In PDF document text
    • https://static.s123-cdn-static.com/uploads/4458622/normal_5ff2a2344aa22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5fb5097d137bd.pdfIn PDF document text
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/rasevikerikaraf-busobunedib-pigirekaxib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5fd0efb144fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5fa786d363358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5fb92ab9a0db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5fad4f1d74121.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/c23fe6e21ad8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8c3c5ddcd96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5f8db42eac2ed.pdfIn PDF document text
    • https://dejewetekexofig.weebly.com/uploads/1/3/0/7/130775583/lifeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_5fb99cb42ba57.pdfIn PDF document text
    • https://lowurewuxuvid.weebly.com/uploads/1/3/4/4/134464573/2d2cd19bb62cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00014856.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14856 17632 bytes
SHA-256: e6f27ec6332272a2c660513681148d4f054cd3c4eb94ffc1af72fc54aab23fd5
font_00_sfnt_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 3900 bytes
SHA-256: 32a99d209d23a3a89ff40f8c5945d8e18b326ec0944bfb9239583f49b99cab3f
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 5344 bytes
SHA-256: a278bf76364159450176f11fd456342cedd05faafe2b3e13934cef0ad160966d
font_02_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 2656 bytes
SHA-256: a37cda85596f57e6059ac1f1313d2f33c9be92add6fb1ab1e12a556d9deccb5f
font_03_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 2328 bytes
SHA-256: 45e304c212156e29fe3879e373e8c4d4eb7f7558b9b507d9aa917d89ddd5a3bf
font_04_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 2108 bytes
SHA-256: bbcb7bd70734be4a31c6bf9508418ed7110da018ae6e7a12fcb8c363b0124794
font_05_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 6072 bytes
SHA-256: 13748e896de1944b203fe54f42db44d18911f6a0b952af5119b25e4123d7892f
font_06_sfnt_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 14332 bytes
SHA-256: 653584792d21ef47183945eaaba7109d0eae13c42ef9c276c93cde71a20941db
font_08_sfnt_off00016340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16340 3904 bytes
SHA-256: 5956679cd3abf8095e92c139b70734f31792f6be5360f7702bb30f8003f45a74