Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ef55783afda878…

MALICIOUS

PDF

97.7 KB Created: 2021-01-14 23:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bbc721ea9c319565cea4cf20db28dc2c SHA-1: 23e448f9cfce186d3cc62ab316c92e9271c1aab8 SHA-256: 31ef55783afda878120dcffa626b9295ca444a5413609fabc3ae0d9a3e6be953
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, identified as a link farm, with several pointing to known malicious redirectors. The ClamAV detection and ML classifier also indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=cannibal+farm+movie++480p In PDF document text
    • https://cdn.sqhk.co/wabajevebe/eSjbmq4/xoxiti.pdfIn PDF document text
    • https://site-1230430.mozfiles.com/files/1230430/pefevolemu.pdfIn PDF document text
    • https://site-1178075.mozfiles.com/files/1178075/block_puzzle_jewel_games_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pemanunid/YkSO7lW/5637993398.pdfIn PDF document text
    • https://site-1191950.mozfiles.com/files/1191950/how_to_watch_netflix_in_vr_oculus_rift.pdfIn PDF document text
    • https://site-1175554.mozfiles.com/files/1175554/final_fantasy_xiv_classes_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fe963e731a3e.pdfIn PDF document text
    • https://ropoxazuwaso.weebly.com/uploads/1/3/4/0/134040565/dazusuwegotovude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_5fb366b140ec9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/pangyo_techno_valley.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/fanarususolukafepudi.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/logosojexibiloxef.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/ritmoneuran_bula.pdfIn PDF document text
    • https://i1.wp.com/keepimg.com/images/PicsArt_09-13-07.42.09.png[/imgIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 3720 bytes
SHA-256: 09d5ec1d025c92008b1be45bd1b27ab8ac867bd1ef02710266bb406f9727485b
font_02_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 5224 bytes
SHA-256: eedae54c1a1f3a57402dfd3fd900101bf9f7fb26a3de2cb3a2b211e44b1f1b04
font_03_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 13236 bytes
SHA-256: b0ec4afdb2f22a6dec23896691544dac01ac4d4087fdd5dbd651112dcdbe918f
font_04_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 11104 bytes
SHA-256: ce12c07bedf425076173f53886c0ad7d1dfd5354b6d01be99edc4c7850c39c63
font_05_sfnt_off00015469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15469 16432 bytes
SHA-256: ee66136062c9e167b6b02970be45e74bccef9be96ca9cc9e1e794c004273edc8
font_06_sfnt_off00016a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A30 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e