Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1bd35f78a24155…

MALICIOUS

PDF

50.2 KB Created: 2020-04-16 06:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 5755303bcdce39a90a9768ee37ce0131 SHA-1: f48561a2fb17bd3e2c7c71b90e3015556a1eb7d7 SHA-256: 4e1bd35f78a2415580884c1970525dab359582fd53c6e3c44dd5371ba22d2bc6
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to various domains, indicating a link farm or SEO abuse tactic. The heuristic 'PDF_SEO_LINK_FARM' confirms this, identifying 12 external PDF links. The presence of 'SE_LOLBIN_RUN_COMMAND' suggests that the document may contain instructions to execute commands, potentially leveraging the embedded URLs. The primary intent appears to be directing users to a network of seemingly unrelated PDF files hosted on compromised or attacker-controlled domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://berlinsorganicbodybutterandscrubs.com/uploads/1/3/0/6/130621205/130621205.html#imagine+dragons+believer+violin+sheet+music PDF link annotation
    • http://ashevillemusicsahavas.com/uploads/1/3/0/8/130813979/pogurepuzem.pdfIn PDF document text
    • http://rikkie-no-studio.com/uploads/1/3/0/7/130738949/dagimola.pdfIn PDF document text
    • http://axelconcreteinc.com/uploads/1/3/0/3/130323743/f65499f4cb9.pdfIn PDF document text
    • http://ketobodyonline.com/uploads/1/3/0/7/130738955/xororuwunave.pdfIn PDF document text
    • http://theawkwardeater.net/uploads/1/3/0/5/130539203/b4baa0c7f864.pdfIn PDF document text
    • http://foundationbiblechurch.net/uploads/1/3/0/9/130969541/8897902.pdfIn PDF document text
    • https://musescore.png?no-cache=1581321662In PDF document text
    • https://musescore.com%2Fuser%2F4073506%2Fscores%2F3482756In PDF document text
    • https://musescore.com%2Fuser%2F5440326%2Fscores%2F4304226In PDF document text
    • https://musescoreIn macro / runtime command snippet
    • https://musescore.png@180x252In PDF document text
    • https://musescore..com/user/4073506/scores/3482756In PDF document text
    • https://musescore.jpg?cache=1560488803In PDF document text
    • https://musescore.png@180x252?no-In PDF document text
    • https://musescore.png@500x660?no-cache=1579179355&bgclr=ffffffIn PDF document text
    • https://musescore.png@300x420?no-cache=1579248470&bgclr=ffffffIn PDF document text
    • https://musescore..MIn PDF document text
    • https://musescore.jpg@150x150In PDF document text
    • https://musescore.png?no-cache=1579248414In PDF document text
    • https://musescore.png@500x660?no-In PDF document text
    • https://musescore..com/user/4073506In PDF document text
    • https://musescore..com/user/5440326In PDF document text
    • https://musescore.png@300x420?no-cache=1574240077&bgclr=ffffffIn PDF document text
    • https://musescore.jpg?cache=0In PDF document text
    • https://musescore.MIn PDF document text
    • https://musescore.jpg?cache=1538235031In PDF document text
    • https://musescore.png@180x252?no-cache=1579179355&bgclr=ffffffIn PDF document text
    • https://musescore.jpg?cache=1488904169In PDF document text
    • https://musescore.com%2Fuser%2F12677026%2Fscores%2F3924896In PDF document text
    • https://musescore.jpg@150x150?cache=1566005417In PDF document text
    • https://musescore.jpg@150x150?cache=1483951159In PDF document text
    • https://musescore.jpg@150x150?cache=0In PDF document text
    • https://musescore.com%2Fuser%2F10026641%2Fscores%2F4588531In PDF document text
    • https://musescore..com/user/14152056/scores/3493496In PDF document text
    • https://musescore.jpg@150x150?cache=1488904205In PDF document text
    • https://musescore.png@300x420?no-cache=1579177268&bgclr=ffffffIn PDF document text
    • https://musescore.com%2Fuser%2F19840951%2Fscores%2F4393326In PDF document text
    • https://musescore.png@300x420?no-In PDF document text
    • https://musescore.png?no-cache=1579248470In PDF document text
    • https://musescore.png?no-cache=1579250393In PDF document text
    • https://musescore..com/i_eat_toothpasteIn PDF document text
    • https://musescore.jpg@150x150?cache=1541074466In PDF document text
    • https://musescore.png@500x660?no-cache=1579177268&bgclr=ffffffIn PDF document text
    • https://musescore.com%2Fuser%2F14152056%2Fscores%2F3493496In PDF document text
    • https://musescore.com%2Fuser%2F4073506%2Fscores%2F348In macro / runtime command snippet
    • https://musescore.com/user/5440326In macro / runtime command snippet
    • https://musescore.com/static/musescore/userdata/avatar/default.com/user/19840951/scores/4393326In PDF document text
    • https://musescore.com/static/musescore/scoredata/gen/6/2/3/4393326/1db77980919e0b2cba40f74f0d0fe7c7ad7bec7c/score_0.com/user/14152056/scores/3493496/embedIn PDF document text
    • https://musescore.com/user/12677026/scores/3924896In PDF document text
    +63 more URL(s)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0A 9316 bytes
SHA-256: 44d44bbfbdb862abfc9c8d91aab815c1b9777b5bdd49ed6ccb7099b7664d3950